Image of the day

From the
ATWB Customer Gallery

IC 5070 + NGC 7000

My Account

New to Astromart?

Register an account...


2020 President - NO COMMENTS (take to Politics Forum)

Previous Polls

Need Help?

Re: 2 inch ap diagonal vs tv diagonal

Started by Greg Shaffer, 03/04/2010 06:33AM
Posted 03/04/2010 06:33AM Opening Post
I have both and rank them both the same in performance to my eye.....

IMO one would have to have nearly perfect seeing and be using them for planetary observations to have a chance at discerning any visual difference between 1/10th wave and 1/20 wave in a diagonal.

Pretty much the same thing applies to comparing a 1/4 wave (diffraction limited) to a 1/10 wave takes pretty good seeing and a discerning observer to detect the difference.

Dont Let Trump Cheat!! Demand Voter ID Now!
20" MidnighTelescopes f/5
8" f/16 Muffoletto Achro
Meade 6" AR6 f/8.0 Achro
Celestron C11
Parallax PI250 10" F/5 Newt
Vixen FL102S,NA140SS,R200SS
80mm Stellarvue Nighthawk with WO APOupgrade lens, 90mm f/16.67 Parallax Achro
LXD75/LX200, Mini-tower, GP-DX, CG5 ASGT, LXD650, GM-8, G11, GM-100, GM-150EX, GM-200 and a Gemini G40
4" portable AP convertable 44" or 70" pier
Stellarvue M7 Alt-Az, TSL7 Pier/Tripod
12.5" f/5 MidnighTelescopes DOB Swayze optics
Statham GA