Quote:
Originally Posted by OzRob
You got me thinking with this post. I would have thought that at that size the dust would be fairly close to the CCD. I used the calculator I posted a link to to do some testing. I found that with my WO FLT110 and the QHY-9 camera for a dust donut that was as wide as the CCD sensor the dust would only be 62.861mm from the CCD. Am I not understanding something?
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No you're correct. It could be on the secondary or any corrector before the CCD but it's too close to be on the nosepiece or 55mm away (like a MPCC). Your 60mm+ sounds plausible given the size of the donut. On my newt that would correspond to that distance approx.