Re: ATM TEX and Star Test Agree!

[Mel Bartels <mbartels@efn.org>]

Hey, Rog, that's great!  The neat thing in my mind is that you are starting a
mental database of foucault vs star test, so given time, you will be able to
give rough wavelength ratings to star tests.


> Tonight for the first time I have been able to star test an 8" f/4 that
> I've recently finished (I wrote to the list about this mirror).  Because of
> some experience I had in which a 6" f/4 that was left somewhat
> undercorrected, star tested very well, I left this 8" undercorrected
> somewhat too.  But curiously, after careful thermal equilibration I find by
> the star test that my 8" IS indeed undercorrected, by roughly the amount
> suggested by knife edge testing (~1/5th wave PV).

--
Clear skies, Mel Bartels
http://www.efn.org/~mbartels