Quote:
Originally Posted by AlexN
.. It looked good, but CCD inspector tells me its about 3.7" off or there abouts.. So still plenty of room for improvement in this department... Curvature of 12.9%...
|
Not sure I agree with your analysis Alex.
Did you apply the correct focal length and pixel image scale into CCDinspector? Using an FL of 1625mm and 2.52 arc sec per pixel and your uploaded M16 image I get FWHM's of around 6 arc sec and a 25" collimation error. (see attached)
The sampling at the FL you are using is fine. It's only when stars start to look blocky that you have an undersampling problem.