[APML] Televue 101 Star test

["Michael" <mledesma1@nyc.rr.com>]

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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