Re: [APML] Televue 101 Star test

[astropix@att.net]

Michael...

     Check out Markus Ludes 'aberrator' page... which has a freeware download 
for star testing refractors. Go to ----------------------------------------->

 http://aberrator.astronomy.net/body_index.html

Best...

Geoff Powers


> Hi all. I know this is an astro-photo mail list, but I wonder if you can
> answer a star testing question. My friend and I tested his Televue 101 last
> nite on Vega with a 2X Powermate, the lens we used escapes me. But, we saw a
> perfect airy disk and about 5 or 6 perfect rings, but moving to the other
> side of focus showed very fuzzy rings. I think the good rings were outside
> focus and the fuzzy
> ones were inside focus, but I could be wrong. I'm trying to read "Star
> Testing Astronomical Telescopes" by Suiter, but it's a hard read. Does
> anyone know what either scenario means as far as the condition of the optics
> is concerned? Regards
> 
> 
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