Re: ATM Focuser travel on Dob

["Bill Kocken" <wmkocken@hotmail.com>]

The most complete answer is to test it by trial and error with your 
eyepieces and your eyes and with and without your barlows. As you probably 
know longer focal length eyepieces generally focus further out and shorter 
eps focus further in.  I suggest you start with your truss a bit on the long 
side and keep shortening until you get everything to work, leaving youself a 
bit of margin for both in travel and out travel.  If someday you find your 
trusses too long, you can always shorten them.  If someday you find your 
trusses too short you can add an extension tube to your focuser to move the 
ep a bit further out.
good luck,
Bill Kocken


>From: "Russell Jocoy" <russjocoy@hotmail.com>
>Reply-To: "Russell Jocoy" <russjocoy@hotmail.com>
>To: atm@shore.net
>Subject: ATM Focuser travel on Dob
>Date: Thu, 07 Aug 2003 07:36:19 -0400
>
>
>("atm@shore.net")
>
>             Hello all,
>                 I have a question that maybe someone could help me with.  
>I am about to mount my
>focuser on my secondary cage. When the scope is in focus should the barrel 
>travel of the focuser
>be at mid-rack?, or closer to in or out. I suppose I could test and find 
>out but I am cutting my truss
>poles for this adjustment. Will a barlow lens change the position of where 
>I should make my focus
>stop.??                           Russ Jocoy
>("atm@shore.net")
>
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