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Thanks, and can you explain how you star test? I'm still to figure that out.
I did notice that the centering of the secondary makes a difference even if collimated with a cats eye, and is noticeable when you use a larger sized chip as the illuminated field of the F4 would be larger than the 8300 diagonal.
So 75% would be round but you'd notice comet shaped stars at the very edges. prominent in a dslr.
Alistair
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