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Mars & M45 4 messages
Yesterday evening's beautiful conjunction of Mars and the Pleiades. 6D/92 combo http://www.abmedia.com/astro/current/Mars-M45-AP92.html Chris
Yesterday evening's beautiful conjunction of Mars and the Pleiades. 6D/92 combo http://www.abmedia.com/astro/current/Mars-M45-AP92.html Chris
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By Chris Cook
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155 EDF flattener 2 messages
It looks like the flattener I received with my AP 155 EDF is not the original. Here are pictures of the original. Look at that price!! -- Jim Phillips
It looks like the flattener I received with my AP 155 EDF is not the original. Here are pictures of the original. Look at that price!! -- Jim Phillips
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By thefamily90 Phillips
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Back to the Future 30 messages
My “New” AP 155 EDF with 4” focuser arrived today. Dovetail plate. Rings, etc will arrive tomorrow. Planning on using it on my AP Mach1 for visual observing only. Pebble finish with what looks like 15
My “New” AP 155 EDF with 4” focuser arrived today. Dovetail plate. Rings, etc will arrive tomorrow. Planning on using it on my AP Mach1 for visual observing only. Pebble finish with what looks like 15
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By thefamily90 Phillips
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Pad in Starfire EDF 2 messages
Yes, that's it down at about 8oclock position. Remove the cell, turn it upside down, then push it back under the lip with a Q-Tip. If you see any others, do the same for them also. Roland
Yes, that's it down at about 8oclock position. Remove the cell, turn it upside down, then push it back under the lip with a Q-Tip. If you see any others, do the same for them also. Roland
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By Roland Christen
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Strange Diffraction from 152mm Starfire EDF 16 messages
Does anyone know what might be causing the strange diffraction spikes I'm getting from my 152mm f/7.5 Starfire EDF with 4 inch field flattener. When I look through the lens down the tube I cannot see
Does anyone know what might be causing the strange diffraction spikes I'm getting from my 152mm f/7.5 Starfire EDF with 4 inch field flattener. When I look through the lens down the tube I cannot see
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By eron2004@...
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Back to the Future of Red light
Thats slick, i have never been positive about the number of mine so Ill have to get out my red light and see tomorrow!
Thats slick, i have never been positive about the number of mine so Ill have to get out my red light and see tomorrow!
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By Ross Elkins
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Need help diagnosing star shapes in my AP130GTX 27 messages
I received my AP130GTX over the winter, and have finally had the skies to test it out recently. I'm finding that the star shapes are a bit odd. My first thought was pinching, but thought I'd bring it
I received my AP130GTX over the winter, and have finally had the skies to test it out recently. I'm finding that the star shapes are a bit odd. My first thought was pinching, but thought I'd bring it
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By Gabe Shaughnessy
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Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective" 63 messages
At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not b
At long last, Sky & Telescope has granted permission for this article to be posted to the Astro-Physics user group. Permission is limited to this user group only. This copy of the article should not b
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By James Stone
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VIDEOS 8 messages
Astro-Physics Mach2GTO Equatorial Mount on a 12inch ATS Portable Telescope Pier https://www.youtube.com/watch?v=-zUAeOE0c3w Carry Handle for Large Refractor Telescopes https://www.youtube.com/watch?v=
Astro-Physics Mach2GTO Equatorial Mount on a 12inch ATS Portable Telescope Pier https://www.youtube.com/watch?v=-zUAeOE0c3w Carry Handle for Large Refractor Telescopes https://www.youtube.com/watch?v=
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By Harley Davidson
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CLS filters. Where to fit in imaging setup? 10 messages
130 GTX was delivered this week. I have not tried imaging in any serious way using scopes till now however I have been using star trackers + DSLR for some wide field imaging. Before GTX was delivered
130 GTX was delivered this week. I have not tried imaging in any serious way using scopes till now however I have been using star trackers + DSLR for some wide field imaging. Before GTX was delivered
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By Rahul
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AP 155edf questions 18 messages
Hello, My question is regarding a FF/FR for AP155EDF. It has the 4" FT focuser version. Is there a focal reducer that would match up to this? I am considering an APS-C size sensor at the moment but wo
Hello, My question is regarding a FF/FR for AP155EDF. It has the 4" FT focuser version. Is there a focal reducer that would match up to this? I am considering an APS-C size sensor at the moment but wo
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By imtl
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How to optimise Stowaway 92TCC spacing? 15 messages
I have a Stowaway which I have paired with 92TCC reducer and an ZWO ASI294 mono camera. Using the bin 1 mode the camera has a pixel pitch of 2.4 micron for just under 1 arcsec / px pixel scale. Even t
I have a Stowaway which I have paired with 92TCC reducer and an ZWO ASI294 mono camera. Using the bin 1 mode the camera has a pixel pitch of 2.4 micron for just under 1 arcsec / px pixel scale. Even t
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By Henry Kwok
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Vignetting with a custom M54 adapter and the TCC Quad 14 messages
I posted this question in another thread about TCC back focus, but thought it might be appropriate here since no one has commented. What is the minimum distance from the back flange of the TCC Quad to
I posted this question in another thread about TCC back focus, but thought it might be appropriate here since no one has commented. What is the minimum distance from the back flange of the TCC Quad to
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By johnrogerjennings@...
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Field Flatener with Traveller and Micro Four Thirds camera 2 messages
Would I need a field flattener for a Traveller to use a Micro Four Thirds Camera?
Would I need a field flattener for a Traveller to use a Micro Four Thirds Camera?
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By Richard Marquardt
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Real electronics glows in the dark ... was: Roland's October 1981 Sky & Telescope article: "An Apochromatic Triplet Objective" 5 messages
John & Jay: So the two of you have stayed true to "hollow" state devices. To the list of other neat stuff I will insert "National" and "Hammarlund". I will add that real radios "glow in the dark". Be
John & Jay: So the two of you have stayed true to "hollow" state devices. To the list of other neat stuff I will insert "National" and "Hammarlund". I will add that real radios "glow in the dark". Be
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By Thomas D Jacobs
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[ap-gto] Recent encoder discussion on CN 5 messages
I have posted a fair amount of stuff to that thread regarding encoder operation on Astro-Physics mounts, including the AP1100/AP1600 and the Mach2. I hope that it’s been accurate – and I am always hap
I have posted a fair amount of stuff to that thread regarding encoder operation on Astro-Physics mounts, including the AP1100/AP1600 and the Mach2. I hope that it’s been accurate – and I am always hap
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By W Hilmo
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Recent encoder discussion on CN
This post has a bit of misinformation about encoders on our 1100/1600 mounts, and I need to clarify how the encoders actually work: Sounds way too complicated to me. When I even suspect that one of my
This post has a bit of misinformation about encoders on our 1100/1600 mounts, and I need to clarify how the encoders actually work: Sounds way too complicated to me. When I even suspect that one of my
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By Roland Christen
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Looking for Adapter: 92 Stowaway+92TCC <-> OAG-8300+FW8-8300+ST-8300
The weather finally got decent here in northern california so I dusted off the trusty ST-8300 this week for some Ha and narrowband work on the fleeting nebula season.... Tonight I set up the 92 Stowaw
The weather finally got decent here in northern california so I dusted off the trusty ST-8300 this week for some Ha and narrowband work on the fleeting nebula season.... Tonight I set up the 92 Stowaw
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By Jeffc
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Optimizing Quad TCC Backfocus Spacing 87 messages
I recall a discussion on this a while back, but I can not find it. A-P sells sets of 1 mm spacer rings for tweaking the backfocus spacing of the Quad TCC. Is there a particular methodology for determi
I recall a discussion on this a while back, but I can not find it. A-P sells sets of 1 mm spacer rings for tweaking the backfocus spacing of the Quad TCC. Is there a particular methodology for determi
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By M Hambrick
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[ap-gto] [ap-ug] Celestial Fireworks 3 messages
I’ve got one of those original AP 10” F/14.6 Maksutovs. Great for lunar and planetary imaging also. AP 10” Damian Peach, Dave Tyler, Jim Phillips Get Outlook for iOS
I’ve got one of those original AP 10” F/14.6 Maksutovs. Great for lunar and planetary imaging also. AP 10” Damian Peach, Dave Tyler, Jim Phillips Get Outlook for iOS
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By thefamily90 Phillips
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