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Equipment Discussions >> Eyepieces

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Reged: 12/26/04

Re: bang-for-buck coma correction in f/5 Newtonian new [Re: Jim Romanski]
      #5569753 - 12/13/12 07:00 PM


In practice, the coma corrector will require some in-travel of the focuser to put it in the right place in the optical path.

Is this the case with most eyepieces in a Paracorr? If so, that would fit the bill for me because my focuser drawtube is almost ALL OF THE WAY OUT for all of my eyepieces!

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Reged: 06/24/03

Loc: Los Angeles
Re: bang-for-buck coma correction in f/5 Newtonian [Re: Scanning4Comets]
      #5569837 - 12/13/12 07:56 PM

Wherever the Paracorr comes to focus, and it's usually about 1/2" in, all your eyepieces will focus there because differential focuser position is taken up by adjusting the tunable top.
The Paracorr, in a way, parfocalizes your eyepieces.

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