[ATM] Rush into F3.5

[Ukyo Chen <ukyochen888@hotmail.com>]

Dear all,
 
I supposed to make a 300mm F4 mirror, but it rushed into 1070mm focal length when I was still using 80# grit, now I can: either continue with MOT and finish the rough grinding at focal length around 1050mm or TOT to extend the focal length.
 
The question is, will I suffer too much from the coma of a F3.5 system in visual with 20mm eyepiece?
 
I do have wynne corrector plan for photograph, it is ok no matter F3.5 or F4. So just care about the coma while observing.
 
Thanks for any comments.
 
Best Regards,
Ukyo Chen
 
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