Quote:
Originally Posted by Paul Haese
I could always do with a bit sharper images Greg. 
Seriously though the SBIG camera I have came with shims installed and I have replicated this when adding adapters. My QSI does not need shimming at all given the size of the sensor. I have not noticed a huge problem but I imagine that large format cameras and very fast systems will show issues more than slower systems with 35mm sensors or smaller as you point out. |
Its not necessarily only the camera sensor being out of square although I think that is the bulk of it. It may also be the optical train typical sag even if slight.
The Trius is smaller than your QSI and it was way off. But then I took off the collimating ring a while ago trying to adapt the camera to a reducer and MMOAG. So the squareness it came with from the factory was lost. Although I thought by simply getting the ring flat to the camera would have stopped that error but apparently the sensor is not 100% level.
The Proline seems a bit easier as the sensor is very square which is what FLI promote that the sensor is accurately levelled.
Also Paul you mentioned the flattener you had was off but I have found that in my case the camera not being square was creating errors in the stars that looked a lot like scope out of collimation or even tracking errors. So I think it may be a bit hard to differentiate between what is a scope optical out of collimation error and what is the sensor not being square to the optics error. I suspect they look the same.
Greg.