Quote:
Originally Posted by Packen104
My ASI 1600mm camera is mounted 90mm behind the CPC925 and I seem to be experiencing vignetting, the outer corners of my images are much brighter.
Focus is fine at that distance but would a longer of shorter distance produce a flatter field?
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Please someone correct me if i am wrong but
1. If you are not using a flattener or reducer then there is only one place to put the camera and that is at the focus point. You may need some adaptors to reach focus.
2. If you are using a flattener/reducer then the chip surface must be 55mm behind the back surface of the glass. Chip surface to top of camera is 6.5 mm and ZWO provides enough adapters to make up the 55 mm.
An edge 9.25 is different as it has a build in corrector so you need to get the celestron recommended spacing from back surface of corrector to chip.