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Michael A. Stecker
Celestron EdgeHD 925
Tests Test 1 on 3-9-2022
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 From photo above: tighter crop with increased color saturation to show the red and blue color fringing |
| Cloudy Nights critism of
Celestron EdgeHD 0.7x focal reducer What's wrong: EdgeHD 925 with .7 Focal Reducer - Experienced Deep Sky Imaging - Cloudy Nights . |
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That is likely the reducer causing it.
I had similar problems with my EdgeHD 8 and the 0.7x focal reducer. This artifact has sometimes been referred to as "rainbow stars". I checked though many images on astrobin and any Edge series scope with a 0.7x reducer seems to have a good chance of seeing this to one degree or another. My survey of images seemed to indicate that the EdgeHD 8 had the worst case of it, the EdgeHD 11 was not as bad, and the EdgeHD 9.25 had the fewest instances of it. But I found images from all 3 scopes that showed it with the 0.7x reducer.
This is truly unfortunate because you can't really get another, better option for a reducer and the scopes are too long to accommodate most of today's small-pixel sensors without a reducer, unless you want to bin.
My solution is to move to a different scope. I have my eye on the not-yet-released Sharpstar SCA260.
-Dan
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