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Originally Posted by rmuhlack
There is some tilt there, my guess would be with the camera sensor itself. Have you tried rotating the camera and repeating the CCDInspector test? If the camera doesn't have its own built in mechanism for the user to adjust, it could be that you just need a tip-tilt adapter, like this or this to offset the tilt of the sensor itself |
I have done a 180º flip on the camera, actually had to so that a USB cable couldn't hit the tripod legs! I found the tilt heading in the same direction, didn't really change. I am a feeling that there may be a small amount of flex in the draw tube on the focuser, I am going to have to give it a more thorough looking over.
Would you have any idea how much of the suggested Curvature would be caused by a little 4" tilt?
Quote:
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Originally Posted by RickS
Congrats on the first light, Colin. CCDInspector does produce variable results, probably because light frames are quite variable too, but you may get more consistent results if you try fields that have simple, bland star fields only.
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I did find it jumping around a bit so I think doing an average of a number of frames should give a more accurate result than any single one. I do take all of the specific numbers with a grain of salt, using it more as an indicator than anything else.
Tonight I am going to do some testing without the Flattener/Reducer. At the moment I need a benchmark, something to use as a comparison. So far I haven't been able to get below 5 arcsec seeing, the seeing hasn't been perfect but it hasn't been that bad. At first I figured it was higher because I was ~11mm too far, now I think I may be a tad too close. In either case, I don't think the light is converging correctly. For bit of playing around I have done indoors, I expect to get ~4% vignetting, have no idea on curvature however.