Varies. I found coma severe enough at f/5 to require a Paracorr. Other observers don't use one at f/4.5. Here's a question: Do you want the stars at the edge to be as tight as the center? You'll need a Paracorr. Don't care about the edge? Probably won't need one. Don't know the answer? Look first, buy later. There's no shortage of Paracorrs.
-------------------- Don Pensack
12.5" Truss Dob, 5" Maksutov
Sustaining Lifetime IDA member, TeleVue junkie
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Re: List of Paracorr settings for all brands of EP
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