Re: [ATM] Hello list, some basic question for a new Dobsonian builder

[Richard <cnc@cncservo.co.uk>]

Hi Mike,

Wednesday, April 6, 2005, 7:11:08 AM, you wrote:

MS> Should I continue to search
MS> for a less expensive 10" f/6?  Go with the 10" f/5 for $400?  Or not eat
MS> for two months and go for the $600 10" f/6?  (comparing apples to apples,
MS> let's say all of these mirrors are from 1/6 wave to 1/10 wave...).

Just to throw in my few UK New Pence worth in, there's not
enough difference between F5 and F6 to pull your hair out over.
If the mirror specs are published in the same way, and you are
definitely comparing apples with apples, then the 1/10th wave
optics would win over the 1/6th wave optics in my not so humble
opinion. How are they quoting the error? rms? pv (peak to
valley)?. Perhaps if you could give us some URLs of the optics
suppliers and there's almost bound to be experience of their
relative quality on this list. There are a lot of very
experienced people here who will bend over backwards to help.
It's a lovely place.

I will also second Mike L's opinion of the focuser. Buy or make
the best you can. You've probably already had email offering to
sell you one (hi don :)

-- 

Best regards,
 Richard



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