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Martin,
Scope Mewlon 210, focal length 2415 mm.
As it has moving mirror focus I use off axis guiding with a zwo 120mm
Imaging camera Canon EOS 60Da.
My recent post (here in beginners) of HCG 63a wast taken with RMS between .28 and .34 arc seconds, the subs are 16 minutes long. Plenty of coma from the uncorrected Mewlon but round stars away from the edges.
I found my RMS decreased to its present level when I went to off axis guiding.
Chris
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