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Finally figured it out...I think...lol

markse68

By markse68
in Getting Started With Imaging

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markse68

markse68

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New Protostar 63mm quartz secondary ordered :) I was wrong and the old one was 70mm but it was for an f4- this is an f4.5 and the 63mm should give 25mm 100% illumination (according to Newt) which should be just enough for my sensor

New secondary holder design forming in my head which will be partly 3d printed so easier to make than the brass one I did for the fullerscope :)

Mark

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Piero
Piero

Thanks for your reply, Mark. I have some other critical questions / checks. These look like small details but they are not at all and can have a lot of impact. Primary mirror Your mirror is

Stu
Stu

@markse68 that sounds like it could be some form of astigmatism which could be caused by a number of things; primary mirror figure or how it is being held, or similarly with the secondary. I’m su

Piero
Piero

Hi @markse68 ,  To me what you described seems like astigmatism mainly (elongated stars), but also some spherical aberration (bloated stars). Astigmatism does not come from miscollimation of

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