Re: Star Testing using large disc

Tenifer wrote:
Do you know where I can get a tested Celestron C9.25" with
at least 1/8 wave optics? I read that you can push a Celestron
C9.25" to 450X with a 1/8 wave optics while you can only reach
250X with a 1/4 wave optics and only 150X with a 1/2 wave
optics

Teni






No.....

You can order from Co 7, and get one that
will pass an optical alignment test, and
they star tested my C 11, but NO ONE (!!!)
sells a guaranteed 1/8 SCT anywhere.
Sorry, but you are not that special.
(unless you got BIG $$$ to spend...)

For the user cost of an SCT, we are getting
a deal. A well corrected, and *perfect* 8"
SCT would cost $5000.00 US minimum IMHO at least.
The kind of perfection you seek, is not what
one usually gets with a mass produced SCT.

Sounds like you need to buy a TMB, TEC, or AP
apo retractor... (if you want that quality...)

My 1980 C8 star tests out extremely well,
I've been able to push 500x on Jupiter,
and the Moon a few times. My C 11, isn't
quite as good, but once or twice a year
I can push 400x + Sky conditions make more
of a difference here. 450x is a LOT to ask
from ANY scope. An awful lot.......

Using a light pole/reflector several miles
away tells me about as much as shining a
flashlight down the tube and seeing how bad
the mirror is..... (total waste of time IMHO)

Nothing but an actual star test will tell
ya the truth !


Personally, I think you are worrying about
the numbers WAY too much... (seriously)
Seeing conditions are what you should be
worrying about....

Go out and USE the darn thing !!!!
I assume you did buy this to look at REAL
DSO's, and stars ?? (didn't you??)



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