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That helps a lot Joshua
What I find difficult with these tools is applying the results. Its all good to measure the collimation error but what magnitude of error is unacceptable.
Maxim has a tool that measures a star profile and reports flatness - I assume its the same sort of calculation but I have no idea what is or is not an acceptable error.
Out of interest, what FWHM do you set as acceptable? CCDAutopilot allows for auto rejection of images above a set limit but I'm in the dark as to what to set it to.
Need to get started on collimating the RC8 I guess.
Pete
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