Quote:
Originally Posted by CJ
Renato, I'd read about that offset secondary on faster scopes somewhere, but the Orion manual shows it as central in the assembly instructions. Those instructions are maybe a bit of a one size fits all approach as they do apply to several different focal ratio scopes. More reading to be done. That aperture mask process sounds worth looking into (hoho). I presume it has just the one hole?
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Yes, one hole does the trick if you can rotate the mask around.
The mask is also useful by itself, as it simulates an apochromatic refractor of size (radius of big mirror- radius of small mirror). On some really lousy nights when everything was very blobby, I'd use my aperture mask to get nice sharp views of open clusters.
Regards,
Renato