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Old 07-08-2017, 11:02 AM
ausastronomer (John Bambury)
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Join Date: Mar 2005
Location: Shoalhaven Heads, NSW
Posts: 2,618
Quote:
Originally Posted by LewisM View Post
Absolutely - NEVER listen to the old twats that tell you you don't use an imaging scope for visual "It's an astrograph - you can't look through it". Pure dribble.

It's a MAGNIFICENT visual view through an FSQ - flat to the edges, pin point stars, port-hole like views.
Well that isn't exactly what the old twats who know what they are talking about will tell you.

Petzval Refractors like the Tak FSQ106 and the Televue NP101 and several others, will all perform superbly as visual telescopes. I have used them both for visual, I know These are both unobstructed systems of very high quality.

Where it all falls apart for using imaging scopes for visual is with Newtonian astrographs with > 30% central obstructions and insufficient backfocus to reach focus with an eyepiece and with other imaging specific scopes like Ritchey Chretiens and the Planewaves with large CO's.

Cheers,
John B
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