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How much FOV Is Too Much For A 800mm Newt?

Started by Big Al, 01/18/2003 06:05PM
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Posted 01/18/2003 06:05PM Opening Post
Alan Koff
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Join Date: Oct 2002

Location: Palm Beach Gardens FL, US

Posts: 67

Have an 8" 800mm Nextonian. When it comes to EPs is 65 degrees FOV as much as I'll need? Or is a Nagler worth it for this rich-field scope?
Need some guidance, thanks.
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Alan Koff
Palm Beach Gardens, Florida 8)

XT10i & StarBlast 6 w/ VersaGo II Mount w/ Steel Legs
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Posted 01/18/2003 06:30PM #1
Ron Bee
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Location: Bonita CA, US

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Well, Alan, it depends on your level of "satisfaction" ;-). However, assuing that you're using a 40mm Pentax XL (I have one) with 65d AFOV, that will give you a very respectable 3.25d true FOV. The 31mm Nagler will also yield about the same (slightly less) FOV.
http://www.atmsite.org/contrib/Prewitt/fieldOfView/

Howvever, I read something about having a too large of a exit pupil on the fast Newt may make the secondary show up :-(; but I don't know this for sure.

Ron B[ee]
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