Quote:
Originally Posted by Carl
Greg Thanks for your input.
I'm using a canon 500d. with a celestron 6.3 focal reducer and flattener plus a radial guider bnetween. maybe i need to ditch the radial guider and have spacers .
I've tried imaging also with a 2 inch adapter between the radial guider and camera. From memory my distance from reducer to chip is around 100mm.
Cheers carl
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Hi Carl,
You are using a reducer plus a flattener or did you mean reducer/flattener? They are 2 separate items and not the same thing.
Reducers reduce the F ratio for example in your case from F10 to F6.3.
Flatteners correct for the curvature of the lens/corrector/mirror and give pinpoint stars corner to corner. They usually don't affect F ratio or only slightly. Their job is to make sure stars in the corner are in focus at the same time as stars in the centre of the image. I was not aware of a flattener for an SCT.
Flatteners and reducers don't usually work together. So if you are using 2 separate items that may be your trouble.
Greg.