Quote:
Originally Posted by Starkler
In a 10" dob I'd get the 13. When the 10 was my primary scope my 14mm pentax had most of the focuser time.
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Depends on whether a Paracorr will be used and how often. The 17E with Paracorr is effectively a 14.8mm. (The 13E with Paracorr is effectively a 11.3mm).
You will use the Paracorr if you find the coma objectionable; some do some don't. In a 10" f5 it will certainly be noticeable.