Re: [ATM] Is There a Difference

["James Lerch" <jlerch1@tampabay.rr.com>]

----- Original Message ----- 
From: "Jerry" <wa4guu@verizon.net>


>James ....
>
>Did you refocus for off axis?

I first set focus for best focus on axis, then repeated for best focus across 
the field of view.  Here's a graphical representation of the results.

http://lerch.no-ip.com/atm/6F8%20Newtonian.gif (60Kb)

While all three optics are diffraction limited on-axis, if you start looking at 
extended objects like the Moon, there seems to be a pretty significant 
difference between 1/4 PVWF and 1/10 PVWF optics (at this size and F/Ratio)

Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction,testing, and coating site)
http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project)

"Anything that can happen, will happen" -Stephen Pollock from:
"Particle Physics for Non-Physicists: A Tour of the Microcosmos"

" Press on: nothing in the world can take the place of perseverance.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent. "
                                                           Calvin Coolidge 

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