Quote:
Originally Posted by ausastronomer
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 |
That is the problem - the urban myth goes wild, without the caveats attached - a true Chinese Whisper.
I was still staunchly told by 3 guys on Cloudy Nights that an FSQ cannot be a good visual instrument because it's an astrograph. You just grin and smile.