Re: [ATM] 12.5" binos (was:sizing secondary mirrors)

["Alan Scott" <alanne1956@hotmail.com>]

Cristopher,
  COOL on the binoculars.  I have looked through Jim Lawrence's 12" binos 
many, many times, and find that merging the images is trivial, even at high 
power.  All you need is a "real time" adjustment on the scope.  Once you are 
"close enough", the eyes compensate and the image "pops into view" .  
Planets are absolutely amazing!!!  What is really freaky is when Jim uses a 
set of close eyepieces, and it makes no difference.  Just like my glasses - 
each eye is different by a few diopters, thus one eye magnifies more than 
the other.  Do you have any plans/pictures on the web?

alan


>
>  To answer your final question, I am building a binocular newtonian with
>12.5" primaries, so my scope will be used exclusively for visual observing,
>mostly of deep-sky objects @ low/mid magnitude with wide fields of view and
>1.25" e.p.s most of the time (though there are some models of 2" e.p.s I 
>may
>be able to use). While I would hope to occasionally use 150-200x for
>planetary and lunar viewing, that will likely only work if I do an
>exceptionally good job building the scope, since merging the images at high
>power becomes difficult unless everything is perfect.
>  Chris

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