What quick-change adapter to get? Astro-Tech AT130EDT - Forums

Topic starter

7 days ago

I recently purchased an Astro-Tech AT130EDT Version II (130mm f/7, 910mm focal length) with the 3.2-inch focuser.

I also have:

--Astro-Tech 0.8× Reducer/Field Flattener for the AT130EDT Version II
--Astro-Tech 1× Field Flattener for the AT130EDT

Currently, switching between these accessories requires removing and reinstalling small grub screws, which is cumbersome.

I'm looking for a quick-change solution that would allow me to easily swap between the reducer, flattener, and a standard 2-inch accessory for lunar and solar imaging without repeatedly dealing with the set screws.

Does anyone know the a correct threaded quick-change adapter or coupling system that would work with the AT130EDT Version II's 3.2-inch focuser?

If there is more than one part I'll need, please tell me that also.

Thank you📷 20260614_040633.jpg📷 20260614_040548.jpg📷 20260614_040649.jpg

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SonnyE

6 days ago

I don’t know of any quick change adaptors for the FR or FF reducers.

I simply use the 0.8X FR/FF reducer on my AT130 because I only do Astrophotography with mine.

The 0.8X gives you a 728 mm with a 5.8 aperture result. I was kind of disappointed. I thought I was buying a bigger step up in FL.

If I ever buy another telescope (not likely) I want a Petzval, so I get what I’m paying for in focal length.

When I added my Pegasus Astro Falcon rotator, I went to great lengths to build my imaging train rigidly screwed together with my ASI 2600 MC camera. (I built in a filter drawer at the camera for my LP filters, or any filters I choose to use.)

In other words, I do not plan on changing the FR/FF but rather treat it as a fixed item to correct the vignetting of the telescope. It might work for visual, but it needs corrected for Astrophotography. So, not something I’d be quick changing.

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Michael W. Dean

Topic starter

6 days ago

SonnyE · Jun 16, 2026, 02:55 PM
I simply use the 0.8X FR/FF reducer on my AT130 because I only do Astrophotography with mine.

So with yours, you just removed those little grub screws, don’t use them again, and just screw in the reducer manually, and it’s enough to hold it tight, right?

I only do astro too. My eyes are too old to enjoy optical. lol.

Thank you.

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SonnyE

6 days ago

Michael W. Dean · Jun 16, 2026, 03:01 PM
SonnyE · Jun 16, 2026, 02:55 PM
I simply use the 0.8X FR/FF reducer on my AT130 because I only do Astrophotography with mine.
So with yours, you just removed those little grub screws, don’t use them again, and just screw in the reducer manually, and it’s enough to hold it tight, right?
I only do astro too. My eyes are too old to enjoy optical. lol.
Thank you.

Yes, Michael. I was a bit uneasy about it, but I followed the instructions for the 0.8X FR/FF and simply screwed it in tight to the back of the focuser tube. Got rid of the adjuster, which I never used anyway.

Later on, when I finally broke down that I wanted a Rotator, I built my imaging train off the back of the 0.8 FR/FF. Not exactly according to Hoyel, they wanted the rotator on the back of the focuser tube. But it works fine doing it my way. And I wish I hadn’t waited so long to get the rotator. I works great with PHD2 and NINA.

By doing it my way, the FR/FF stays a fixed part of the telescope, and only the camera and filter drawer are rotating.

I’ve been really happy with it, and really, really happy with my images. My rotator simply turns the filter drawer and camera. Took several threaded reducers and adaptors to get the back focus which wound up at under 55mm anyway. NINA Framing lets me choose a rotation (frame the shot), or just let it find it for me with Plate Solving.

Way back I used various filters with my previous set-ups. (Color and Mono) But with my 2600 MC I only filter my light pollution (Antila Quad LP) and I’m happy with that. At 76 simpler is better with me. 🤠

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