Astro-Tech AT90CFT f/6 Triplet Apo Refractor Carbon Fiber OTA

I purchased the scope for imaging, which it has worked perfectly for. Sharp to the corners on both my APS-C and Full-Frame DSLRs. Some vignetting full-frame, no with APS-C. This is with the AT .8X reducer-corrector at F/4.8. It works beautifully with my ASI533 MC Pro camera. Visually, excellent color correction, and tack sharp. Excellent build quality and precise focuser. For imaging, I've found no need for an electronic focuser. It is that precise manually. Cooldown takes a bit longer than a doublet, but about what you would expect for a triplet of this aperture. Highly recommended. Great travel and imaging scope. (Posted on 3/20/2024)

I bought this as an imaging instrument to use with my AVX mount for traveling to darker skies near me. It has definitely exceeded my expectations. It works great with the .8x reducer/corrector on my ASI533MC Pro camera. I've tried it with both APS-C and Full-Frame DSLRs and it is sharp to the corners with a bit of vignetting at full-frame. Visually, it has excellent color correction and tack sharp. It takes a bit longer to cool down than a doublet, but the results are worth it. Great build quality, and the focuser is very precise. I find no need for my electronic focuser for imaging. Focus is no doubt with it manually. (Posted on 3/20/2024)

In my second year of astrophotography, I have and 11" HyperStar and 6" HyperStar. I use the 6' for travel. On very bright targets, the 6" HS has trouble with collimation (I have the ZWO 2600 mc) and star halos, and internal reflections. I had been looking at APOs for some time, and the AT90CFT checked the boxes for portability and the quality of a good refractor system. I believe it is going to deliver really great astrophotographs. Optically, I had a clear window and I focused on Jupiter as the tough test for chromatic aberration. Absolutely none! Furthermore, cloud bands were sharp, moons pinpoint, and GRS was clearly visible. I set up the focal reducer and camera to work on achieving correct focus, and to align the AT60 guide scope. The single image I took of a radio tower (too cloudy for astro), was sharp and clear across the frame. Looking forward to clear skies to see what this telescope can do visually and photographically. (Posted on 12/15/2023)

After much anticipation, the AT90CFT was delivered to me (well and safely packaged, of course) two weeks ago.
I had been researching smaller aperture refractors mainly for travel portability and something light enough for a sturdy photo tripod to use as a telephoto lens/telescope combo. I took a hard look at the AT80edt for awhile (I'm stuck on triplets). Then...enter this gem, a telescope that is surely destined to be a classic (is already a classic, IMO).
Thus far, this scope has met/exceeded my expectations in a big way. And a selling point for me was the fine soft case, with extra room for accessories (again, the portability factor), as well as the carbon fiber tube with a bit more photon ability.
As with other Astronomics offerings (I also own an AT130edt), this scope is of fine quality and a joy to own and use for multiple applications.
Thank you, Astronomics! (Posted on 6/13/2023)