From: "CSC" 
To: "Atm" 
Reply-To: "CSC" 


It's time to get another eyepiece.  You need at least 200x to separate out
the fine structure in the star test. You'll eventually need about 25x per
inch for most of your viewing, so it's time for a 5-8mm eyepiece, or a 3x
barlow. or both.
You'll rarely use extra high power so don't run out and buy a 3-4 mm e.p. 
I like the Plossl's from Orion at $39.95.  I frequently use a 7.5mm, a real
fine eyepiece, and liked their 17 and 20, which I proudly, yet regretfully,
gave away with scopes I made. A couple of these eyepieces will keep you
happy for a long while.


I also own a 5mm Radian for critical planetary/star test on my f/10 and f/7
scopes.   If you can afford one ($200 from the NYC discount camera stores,
get one, say 250x (6mm).

Colin

-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net]On Behalf Of Garth
Arsenault
Sent: Wednesday, July 16, 2003 11:09 PM To: atm{at}shore.net
Subject: ATM secondary mirror



Hi list,

I have just finished figuring my 10" BVC mirror (what an ordeal!) I
ended up doing my figuring with a full sized lap and it only took about 25
figuring sessions (groan) to get my figure. I am anxious to star test to
verify if the 1/25 wave error is accurate from my foucault test. I have the
rest of my truss style dob almost complete. What is the best material to
fasten the secondary mirror to the diagonal wooden dowel. Should I use
silicone, epoxy or another adhesive?

Also, To date I have only a 25mm eyepiece, will this be sufficient to do my
star test or do I need to have more power than this will give me? My mirror
has a focal length of 57.5 inches which will give me about 60X mag.

Thanks

Garth

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