SJ-Astronomy / Imaging SIG Meetings

How not to Photograph a Total Solar Eclipse
Brad Templeton

The best plan for photographing a total solar eclipse is just to watch it. But if you've seen a couple and have the itch to photograph, the best plan is to watch it while your computer photographs it. It's the highest dynamic range photographic target there is, and no picture can capture it, but you can capture something. Brad Templeton, who has seen 6 total eclipses finally got some decent photographs after 3 tries, and good ones after 5 and will share techniques and advice if you have the itch for 2024, or just want to hear some travel astrophotography stories. Hook up to your 4K display to see the photos in full resolution.

************************* This is an online event *************************

The Imaging SIG meets roughly every month Online to discuss topics about imaging. The SIG is open to people with absolutely no experience but want to learn what it’s all about, but experienced imagers are also more than welcome, indeed, encouraged to participate.

Ed Beshore

OSIRIS-REx is coming home.

What will it tell us about the history of the solar system?

On September 24, the OSIRIS-REx spacecraft will complete its 7-year journey to the primitive asteroid Bennu, returning to Earth with a substantial sample of surface material. Why are these asteroids important? What were the challenges in the mission design? Why did the science team have an unusual role in the operational aspects of the mission? Did our assumptions about what we would find at Bennu pan out or was it a total surprise? What will happen with the sample? Ed Beshore, former Deputy Principal Investigator of the mission will discuss these and other questions.

************************* This is an online event *************************

The Imaging SIG meets roughly every month Online to discuss topics about imaging. The SIG is open to people with absolutely no experience but want to learn what it’s all about, but experienced imagers are also more than welcome, indeed, encouraged to participate.

Evolution and Transitions of An Automated Home Observatory
Jerome Yesavage

My Observatory has been in operation for a bit over ten years now and has evolved through four telescopes but still uses the same system backbone. The automated system centers on the use of Expert Scheduler and ACP (DC3 Dreams) software. Highlights are this is a roll of roof 6’ cube sitting on my own Eichler roof on the Stanford Campus.

The scopes used in the system have been in order chronologically: C8, Takahashi 180 ED, Stellarvue 130 SVX and C11 Edge. Another major transition has been from CCD to CMOS along the way. One other evolution was the upgrading of my image processing build to the latest Ryzen 7950 processor: https://pcpartpicker.com/b/CQDcCJ#cx4156803

A video of the system will be shown and a few screen shots of how processing integrates with Pixinsight via OneDrive. Images from the journey are in: https://www.astrobin.com/users/jerryyyyy/. A major effort fitting of our light pollution was a complete collection of the 313 Sharpless2 Hydrogen Alpha objects: https://www.astrobin.com/users/jerryyyyy/collections/1559/

From 5 inches to 5 meters
Brian Valente & Greg Stein

Looking at how astroimaging is done from the backyard to the largest instruments, and points between

This talk is inspired by our recent trip to several observatories in the Atacama Desert. We have been remote imaging since 2019 and spent a week traveling to look at other rigs and approaches, and culimated in a once in a lifetime observing session at the Baade telescope, one of the twin Megallan telescopes at Las Campanas. Part gear details, part comparisons of other rigs, part travelogue, and part seeing what does (and does not) separate the backyard from the largest terrestrial telescopes in the world.

Brian Valente and Greg Stein have been imaging individually and as partners for many years. Brian currently works with Losmandy Astronomical and Astro-Physics, Greg Stein is an accomplished astrophotographer among his many pursuits.

Introduction to Astro Pixel Processor
Rich Klein

Astro Pixel Processor is a complete deep sky image processing application with several innovative and useful features. The software can be used for calibration, registration, normalization and integration as well as some final processing such as gradient and light pollution removal, RGB combine, color calibration, non-linear stretching and others. A major plus for beginners is that it provides a clear, linear workflow with a shallow learning curve, and the default settings on almost all of the built-in tools work very well, allowing even inexperienced Astrophotographers to produce very good images.

I'll introduce Astro Pixel Processor by processing a one-shot color image from start to finish, using APP and two external tools (GIMP and Topaz AI Denoise).

My Astroimaging Story,
Stuart Heggie

This talk will describe my astrophotography, including volunteer roles, gear, and software choices. I will go over several recent images and the challenges they presented: an M31 LRGB 2-Frame Mosaic, a Veil Nebula 4-Frame Mosaic in NB+RGB, M17 in Ha, RGB and HaRGB, NGC1333 (APOD), The Bat & Squid, M42 and Milky Way Skyscapes.

About the speaker
Stuart has had a lifelong passion for all types of photography (https://www.stuartheggie.com). He started astro imaging with film in the 1990s, and built his first observatory, an 8'x12' roll-off roof, at that time. He later built his current 10x14' roll-off on his farm, plus a 2nd 2-pier clamshell for his small hosting business. He is an active member of the Royal Astronomical Society of Canada (RASC) and the chair of their Astro Imaging Certificate committee. He was the Ops Lead for the RASC remote telescope hosted at Sierra Remote Observatories (SRO) where he helped the team master the gear and assisted the photography team in target selection and in CCDAP scripting. Stuart shared an APOD in March 2021 with his good friend Kerry-Ann Lecky-Hepburn, an LRGB image of ngc1333.

he Dark Side of Luminance Subframes
Alex Woronow

Collecting luminance subs along with RGB subs has been a long-standing approach to teasing-out the most possible detail in an image. But my recent analyses indicate that L subs do nothing to boost detail in the domain of modern image processing. I will demonstrate this with examples and explain why what may once have been a wise practice (collecting a load of L subs) has become arcane and now simply sucks down telescope time and processing effort.

Astro-processing: What I learned in the past year
Hy Murveit

In the past couple years we've had excellent talks to the SJAA SIG, and many were concerned with improving our techniques for process astro-images. There have also been significant advances in the software available to process those images. Because of all that (and the rain), I was inspired to review the past talks and reprocess many of my images. I found that, to my eye, I was able to significantly improve most of them, starting from the pre-processed images and scrapping most of the old work. In addition, the processing took me much less time than I had spent in the past (probably a couple hours per image), and produced less frustration as well.

In this talk I'll go over the basic workflow I used, heavily borrowing from recent talks. My images are almost all taken from my home in Silicon Valley, using 10-30 hours of mostly LRGB images, and mostly from a 10" reflector. I'll present the WBPP, synthetic L, blurX/noiseX/starX, GHS, Photoshop/Lightroom workflow I used, and show a few full images being processed.

A pretty complete before/after photo album demonstrating the improved images can be found at
https://photos.app.goo.gl/yYx6U5rZ25zGDjcFA

GHS: Image Stretching 101
David Payne

Since the initial release of the Generalized Hyperbolic Stretch (GHS) script, uptake of the script has been high due to the control and flexibility it provides for image stretching. Many imagers have attested to what it can do and shared excellent results that they have, at least partially, attributed to the technique. However, to many, it appears complicated and “black-boxy”; some may even be intimidated by the options. Using the analogy of a bicycle, with this presentation I hope to show what the pedals, brakes, and handlebars do so that even a neophyte can ride GHS. Thanks largely to the work of my GHSAstro colleague, GHS has recently been ported to an easy to use module/process in Pixinsight. This is transformative in its use and workflow incorporation, including the use of standard image previews that most Pixinsight users are already familiar with. The approach I take design is to make use of both the histogram and image previews to set the sliders and set up the stretch. I will first show what the histogram represents and how it should look for various types and styles of astronomical images. Adjustment of both brightness and contrast distribution can then be selected to change the image and histogram towards the desired result. I will also demonstrate how the five main GHS parameter/slider inputs each affect both the histogram and image stretch results including shortcuts for new users. I will also explain how features of the new GHS process also allow for dynamic fine adjustment of parameters to get the histogram and image just right. Again, through examples, I will show how GHS can be used seamlessly with other processes, both starless and starred image components, and both monochrome and colour images, including colour balancing and manipulation.

Introduction to Planetary Imaging
Richard Senegor

Let's take a dive into everything you need to know to hit the ground running with planetary imaging. We'll cover the absolute basics, benchmarks to check your progress, lessons learned the hard way (so you don't make the same mistakes!), and a live walkthrough of processing planetary data. In fact, you'll probably realize that you already have everything you need to get started in your own backyard.

Processing Narrowband Images in PixInsight
Francesco Meschia

With the summer behind us, hopefully many of us are sitting on a treasure chest of narrowband data from the great showpieces of the Milky Way. In Francesco’s 2nd talk on narrowband, we’ll see a few examples of the techniques that can be used to process them with PixInsight.

Engineering custom astronomical accessories using technologies popularized by the maker movement.
Julien Lecomte

In this presentation, I will attempt to inspire and encourage all of you to try out and apply some of the technologies popularized by the maker movement, such as 3D modeling and 3D printing, in combination with optics, electronics, and software programming, to create custom astronomical accessories that can enhance your own equipment. At the same time, I will also cover a few important tenets of the maker movement, which are collaboration, information sharing, and open-source. Finally, I will talk about a few of the accessories that I have recently created and how they have contributed to increasing my enjoyment of the hobby.

Narrowband imaging – why and how
Francesco Meschia

Capturing spectacular images of nebulae with narrowband filters has become almost commonplace, and for some good reasons. In this meeting we’ll see what those reasons are, and how to capture narrowband data effectively.

In a future meeting, we’ll see how to process the data into a color image.

Alex Woronow, Creating RGB/SHO images

Topics to be Addressed

What objects have emission lines worth capturing?

How do emission lines arise?

Separating the Emission Lines from the Continuum

My Script: Narrowband Assistant

How about multi-narrowband imaging?

Artificial Intelligence for Astro-Image Processing

Alex Woronow

For the single task of image sharpening, we have a multiple filters designed to reach our goal, and we probably will need to use several together for this singular task. Now, a single, quick, easily implement artificial intelligence tool does the job quicker and more effectively than the battery of old-school alternatives. The same is true for image noise removal, image enhancement, and image resizing, and more. My talk will describe the general approach taken by the current artificial-intelligence image-processing technology and describe and illustrate some of the results one can obtain on astro-images.

The Our Galaxy App: Understanding the 3D Nature of Our Galaxy

Bill Tschumy

Amateur astronomers generally know where to find deep sky objects in the night sky, but few are aware of their physical locations within the Galaxy. Our Galaxy is a cross-platform app that helps you understand the structural components of the Galaxy and visualize the locations and physical properties of deep sky objects in and around it. Bill will discuss the creation of Our Galaxy and use the app to illustrate what we know about galactic structure and show where some well known deep sky objects are located within and around it.

Bill Tschumy founded Otherwise Software in 1992 to develop innovative software. Besides programming, Bill’s other interests are amateur astronomy and astronomy education. In 2009 he got the chance to combine his programming skills with his love of astronomy and co-authored SkySafari, one of the most popular astronomy apps for mobile devices and Macintosh. Bill has since left the SkySafari project and is now obsessed with understanding where the deep sky objects we observe are actually located in the Galaxy. The Our Galaxy app is the latest result of his efforts.

Astroimaging and photometry in near-infrared spectrum with a backyard telescope rig
Nikola Nikolov

Most astrophotography rigs use filters within the visible light spectrum to create beautiful and colorful images of deep-sky objects. However, there is a different set of filters used by scientific telescopes for photometric measurements, knowns as SDSS u, g, r, I, z filters. They have been initially used by Sloan Digital Sky Survey and today they are also available for small backyard telescopes thanks to Astrodon and Las Cumbres Global Telescope Network. If you have a telescope with a CCD camera and SDSS filters, you can do scientific astronomy and photometric measurements from the backyard.

In this talk, I will show interesting results with SDSS near-infrared filters, which cut off most of the visible light and leave only photons with wavelengths greater than 800nm. Near-infrared astroimaging reveals interesting details of galaxy structures which are usually obscured in LRGB stacks, extremely distant galactic clusters, and sometimes hidden objects in our Milky Way.

The Tycho Tracker
Daniel Parrott

Tycho is a new software program to improve upon the detection and measurement of astronomical objects including asteroids, comets, variable stars, and exoplanets. One of its unique features is that of synthetic tracking, which permits one to detect very faint asteroids by exploring a wide range of motion vectors with GPU acceleration. In 2021, over 60 new Near Earth Objects (NEOs) were discovered by amateur astronomers using the Tycho software.

PixInsight and friends: processing garbage… err, data with issues
Francesco Meschia

We’ll re-create the image of NGC 7331 and the Stephan’s Quintet that received the Astrobin “top pick” silver star last September, starting with 17.5 hours of challenging RGB lights taken from a Bortle 7 backyard. Gradients, noise, details… PixInsight will get by with a little help from his friends: Adobe Photoshop, Topaz Denoise AI, and introducing StarNet++ V2!

Processing ‘clean’ data in PixInsight: the Helping Hand nebula.
Francesco Meschia

We’ll go step-by-step from the master lights to the final image of the Helping Hand nebula, one of Astrobin’s “Top Picks” of December 2021. The data was acquired at Pinnacles National Park, with very little light pollution. The masters were calibrated with the Weighted Batch Pre-Processing script, and they are available for download.
https://drive.google.com/drive/folders/1Q7z3JXknmHOUTtnq2wqs9_wqStxwv1Bl You are encouraged to try and process these ahead of time and bring any questions you have to the presentation.

GHS Stretching 101 – Part B – Applications
David Payne

Following up on the understanding of brightness, contrast and control of the Generalized Hyperbolic Stretch provided in Part A of this talk, Dave will be providing examples of the application of GHS to a variety of image types to customize them to what you want to see and to your own taste. He will illustrate how GHS can accomplish an initial stretch from linear to non-linear, used to make finer adjustment to an already non-linear image, and how GHS can be incorporated throughout your workflow to work in concert with other image enhancing processes. Applications will range from terrestrial images to solar system to a variety of deep sky targets. Examples will be drawn from monochrome to broadband colour to narrowband data and include starry, starless, and star images. Processes demonstrated will include colour calibration, HDMRT dynamic range regain, and control of star halos. Finally, Dave will be illustrating how the components of an image: stars and starless, RGB and narrowband, luminance and colour information can all be brought together with the help of GHS to create your final image.

In early November, John Pane had a rare opportunity — four clear, smokeless, and moonless nights at his home in the northern suburbs of Pittsburgh, PA and time available to devote to imaging. In this talk, John will discuss how he capitalized on the opportunity to create these eight images. https://www.flickr.com/photos/johnpane/sets/72157720226864279/
In imaging so many targets, he necessarily limited the time spent on each one, and thus their resulting quality. This principle of trading the optimal for the "good enough" is also reflected in his choices of equipment and to image from his suburban driveway instead of a darker site. John will also discuss some aspects of his ever-evolving image processing workflow.

Slides for this event: https://drive.google.com/file/d/1-FEn74IdXl-hCCddzP8x-rgCXUl-DQY_/view

Akarsh Simha

Adapting plate-solving for visual astronomy

Plate solving has become increasingly a standard component of the workflow used by amateur astrophotographers today. Thanks to plate solving, imagers can still hit the exact field they want without relying on the mount's raw pointing, or building sophisticated pointing models. The pointing needs of visual observers are much more relaxed, but the deeper observations beyond NGC/IC would still greatly benefit from arcminute-grade pointing, so that we can be certain that the faint object that takes minutes of observing to make an appearance is bang in the center of our fields. However, existing "Digital Setting Circle" (DSC) systems with encoders struggle to achieve accuracy higher than tens of arcminutes, without pointing models. Issues like the leveling of the Dobsonian, the roundness of the ground board, flexure in various aspects of the Dobsonian design and so on have a significant impact on accuracy. Can we instead use plate-solving, through a finder scope, to point dobs for visual use? This talk will go into the challenges of adapting plate-solving to visual astronomy, and my attempts at addressing some of these challenges. A field demonstration of a very crude prototype that I have built over the pandemic will feature at the end. The emphasis is that with more engineering effort, I predict that this can be turned into a system that is much more accurate and robust to scope mounting errors than DSCs.

“Imaging Projects for Backyard Scientists”. by Bob Buchheim

My purpose tonight is to entice you into applying your imaging skills to a different sort of amateur astronomy – that of the Backyard Scientist – making discoveries, gathering data, and doing research that provides genuinely knew information about the universe, pushing the boundaries of the “unknown” a little bit farther out. If you can take a decent astro-image, you can also make scientifically-useful measurements of astronomical phenomena, such as stellar variability, the rotation and shape of asteroids, and binary-star orbits.

Rich Ozer, the Director of the Golden State Star Party (GSSP) will discuss the GSSP and the future of star parties.

We will have a talk this month from John Hayes. Here's the talk description followed by John's Bio. There will be Q&A during/after the talk.

Optics Adventures During the Pandemic: Engineering a Remote Imaging Telescope

This is the story of engineering a remote 0.5 m telescope that will be deployed in Chile for astronomical imaging. Getting this system configured, tested, and running turned into a year-long project while in pandemic isolation. This project drew on nearly every optical engineering discipline including optical design, physical optics, optical testing, mechanical design, sensor optimization and systems engineering—along with some “garage-shop” problem solving. A new AI based wavefront analysis system was also used to precisely evaluate optical alignment. We’ll start with a review of the optical design of a 20” Planewave CDK telescope, look at the optical system for guiding and auto-focusing, and review some of the considerations for selecting an appropriate imaging sensor. Then we’ll look at what it takes to actually configure, test, align, and operate the telescope as a part of the commissioning process in the real world. Along the way, we’ll encounter a number of practical lessons that apply to any optical engineering project--whether amateur or professional.

Dr. John Hayes received his BS in Physics and Astronomy from the University of Arizona, in 1975. He received MS (1981) and Ph.D. (1984) degrees in Optics from the Optical Sciences Center at the University of Arizona. Dr. Hayes became involved with WYKO Corporation shortly after its inception in 1982 and spent 15 years as a member of the technical staff, senior management team, and corporate board. As a Research Professor at the College of Optical Sciences (1999-2001,) Dr. Hayes developed interferometric vibration-compensated metrology solutions for aerospace and large telescope applications. In 2001, Dr. Hayes cofounded 4D Technology Corporation where he served as president through 2006 and a board member through 2018. The author of many technical publications, Dr. Hayes also holds numerous patents in the areas of optical testing, atomic force microscopy, suspension arm metrology, and dynamic interferometry. Many of these technologies have been used to fabricate optics for the largest telescopes in the world including the James Webb Space Telescope. In his spare time, he operates his own remotely controlled 0.35 m telescope in New Mexico for imaging deep sky objects. He is currently configuring a new 0.5 m system that will operate remotely under the southern skies in Chile. He has been recognized with numerous IOTD awards and a NASA APOD for his images and enjoys using his engineering background to further explore and advance the state of the art in amateur astronomical imaging. He currently serves as chairman of the James C. Wyant College of Optical Sciences advisory board.

Glenn Newell, Paolo Barettoni and Jo Herz will each spend 10-minutes giving their perspectives on 3-D printing, perhaps showing off their productions, followed by a general discussion on the topic.

Nina updates, Group image sharing, SJAA EAA project update, Imaging locations opening up post Covid restrictions, etc.

Glenn Newell will discuss his latest (not so) secret Pixinsight weapon, the Autointegrate script and will give an update on (technical) plans to safely share Live Stacked images with the public at SJAA events. Then Francesco Meschia will give an introduction to NINA, Nighttime Imaging 'N' Astronomy imaging suite.

This month we're very excited to welcome back long time member and former host of the Imaging SIG, Mark Striebeck. Mark, along with his friends Manoj, & Richard, is part of a 3 man team that threw in together to create the Namid Remote Observatory. Mark will be sharing some of their experiences getting up and running down in New Mexico.

Mark Striebeck graduated from Brunel University in London in 1992. Since then he has worked at several different companies. One of these companies being Google where he has been the Engineering Director since 2005.

Please be sure to check out Mark's Blog and his Astrobin Page at:

https://mstriebeck-astrophotography.blogspot.com/

&

https://www.astrobin.com/users/mstriebeck/

Please also bring along your recent images to share with the group after the main presentation!

This Month's Topic:

Galaxy season is upon us! This month's meeting will be an open discussion featuring some of the amazing images that our members have produced recently as well as new and ongoing project updates. Please bring your recent images & adventures to share!

This month we're very excited to have Alexander Curry of Telescope Live presenting on their advanced remote observatories. Alex will be talking about their facilities and the different programs available to the public.

Alex has been part of the Telescope Live since it's early days, helping setting up the very first telescopes. He's an amateur astrophotographer and is responsible for customer support, tutoring, and user experience. He also helps with the overall operations.

This month Glenn Newell, SJAA Director & leader of the SJAA Imaging Workshops will be hosting our meeting! It will be an online, open discussion about anything and everything that we’ve been up to lately.

Paul Mahany: Latest Images and mods from a RASA 11"
Hy Murveit: A new Polar Alignment Routine (doesn't need Polaris) comming to Kstars/Ekos
Glenn Newell: SJAA's new Vixen 140SS
Steve Sells: First light with new gear

Our fellow member Steve Sells tells us about his Sky Watcher Star Adventurer & how he navigates the night skies. We follow Steve's presentation with some general discussion.

Presentation on "Instrument Packages" for the different types of Astro Imaging" and general image sharing and discussion.

We're very happy to have our member Francesco Meschia showcasing some techniques that he used to clean up and bring out more detail in his recent Gecko Nebula Image. Francesco will use StarNet++ and Pixinsight to correct a dust mote while still in the linear stage and also will be showing us how he enhanced the nebula while keeping the stars under control. Glenn Newell will also be sharing his experiences imaging and processing Mars during the amazing opposition that we've all been enjoying so much!

Check out Francesco's Gecko Nebula on his Astrobin page at:

https://www.astrobin.com/9nlqwd/H/?nc=user

Also member Glenn Newell talks about planetary imaging

Glenn's astrobin: https://www.astrobin.com/users/dts350z/

We're very excited to have member Hy Murveit presenting this month on:

Recent Improvements to KStars

He'll be introducing KStars/Indi which is an open-source software package for astrophotography. Hy is one of the developers of KStars and will show us several improvements he's implemented recently including changes to improve guiding, as well as a new module that can be used to monitor or analyze current or past imaging sessions.

This month we're very excited to have Eric Coles presenting on:

The Hubble Palette – Mapped Colors of Emission Nebula with Multi-Level Processing: A Live Demonstration

Eric is a phenomenal astrophotographer and a master of image processing.

Please check out his gallery at https://www.astrobin.com/users/coles44/

This Month's Online Imaging SIG Meeting Topic:

Telescope Collimation Using Artificial Intelligence

This month we're excited to have Dr. Gaston Baudat PhD of Innovations Foresight presenting on collimation of the telescope optical elements with a novel approach which uses artificial intelligence for doing wavefront sensing (WFS) without any specific hardware other than a focuser, an imaging camera, and a computer. Dr. Baudat will discuss the basics of optical aberrations, WFS, point spread functions (PSF), and optical element mis-alignment effects.

Gaston was born in Switzerland near Lake Geneva. He received his engineering degree in electronic and computer science from the Swiss University for Applied Sciences at Yverdon-les-Bains. In 2006, Gaston received his PhD in computer science in the field of machine learning from the Conservatoire National des Arts et Métiers (Paris). Gaston has been involved in opt-electronics and analog/digital sensor designs, as well as optical document sensing and pattern recognition, filing many patents, and publishing papers in scientific journals and conferences in advanced statistics, machine learning and artificial intelligence. He eventually moved to the US becoming the senior research director for a U.S. corporation from which he retired in 2018.

His passion for astronomy started many years ago while reading space magazines and books, as well as watching the first moon landing. In 1986 he went to Madagascar to take pictures of Halley’s Comet. One of them won a contest in the French science magazine "Science & Vie". Over time, his interest in astronomy, especially for astrophotography, has grown. He created and designed the on-axis guider technology (ONAG), an award-winning novel approach for auto-guiding. Gaston is a co-founder of Innovations Foresight (IF), a Pennsylvania-based company, for making innovative products, such as the ONAG, live focusing, full frame guiding technologies, or wavefront sensing using artificial intelligence, all either are patented or in a patent pending status. Gaston has given many lectures on astronomical topics on seeing theory, wavefront analysis, and optimal guiding and focusing. He is also a private pilot and accomplished diver.

See Gaston’s webpage at http://www.innovationsforesight.com

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The Imaging SIG meets roughly every month (currently online) to discuss topics about imaging. The SIG is open to people with absolutely no experience but want to learn what it’s all about, but experienced imagers are also more than welcome, indeed, encouraged to participate.

San Jose Astronomical Association. June 2020 Imaging Special Interest Group meeting.

Arduino Flat Box project, Solar Imaging Rigs, and general discussion and sharing

San Jose Astronomical Association. Dr. Elinor Gates on Adaptive Optics.

Gary Lopez, https://www.garylopezphotography.com/

Astrophotography as Fine Art

San Jose Astronomical Association Imaging Special Interest Group Meeting. May, 21st, 2020. General Discussion and Sharing.

San Jose Astronomical Association Imaging Special Interest Group Meeting held August, 21st, 2018 at Houge Park in San Jose, CA. Setting up an ONAG with focal reduction.

San Jose Astronomical Association Imaging Special Interest Group Meeting August 15, 2017 at Houge Park San Jose. Glenn's latest rig, share first images, compare and contrast to smaller/DSLR rigs, and demo Photoshop processing techniques