How many of you use an Edge HD scope with the 0.7x Celestron reducer on full frame cameras with success? It seems like a lot of folks have trouble getting good stars out to the edge of the field with this setup on full frame sensors. I created a poll with some different answers to try and get some concrete data. Regardless of whether or not you had success, please share your experience.
Edge HD scope with 0.7x reducer on full frame cameras: success stories?
Did you have success with your edge hd telescope, 0.7x reducer, and full frame camera? (Did you have good stars to the edge of the field)
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What size are you looking at? With my EdgeHD 8” I get pretty strong vignetting in the corners. Still ends up looking acceptable to me, but I bet it would be pretty bad at full frame. I think the 8” has the smallest imaging circle with the reducer in the entire lineup, though.
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Razvy · Apr 14, 2026, 09:43 PM
What size are you looking at? With my EdgeHD 8” I get pretty strong vignetting in the corners. Still ends up looking acceptable to me, but I bet it would be pretty bad at full frame. I think the 8” has the smallest imaging circle with the reducer in the entire lineup, though.
The 9.25 and larger because technically they should work with full frame sensors.
edge 8” with its reducer is for APS-C unfortunately. It can illuminate a full frame sensor with a flat field only at F10
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The Edge HD 8 is only capable of supporting full frame at F/10, and even then it has vignetting issues on the corners of the FOV because the diameter of the scope’s image train is limited to 42mm. (Baffle tube is 36-38~mm, but the light path clears it to 42mm.)
I only image at F/10 at this point; as the F/7 reducer also seems to degrade image sharpness.
But at F/10 it hits way above it’s weight class if you shoot from a good location like I do.
Personally, I’d fork out for the 11, simply because it’s aperture to price increase compared to the jump from 8 to 9.25 is much more reasonable.
I’ve had a lot of success with my Edge 8 over the last 6 years, but I do think the optical design leaves a lot to be desired for more nuanced, serious imagers, and those using larger sensors (contrast isn’t the best, neither is the optical sharpness, and there is chromatic abberation on your stars- however minute), which I believe is why I see a lot of imagers use RCT’s, CDKs, etc when they pass a certain aperture point, versus the much cheaper EdgeHD series.
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