astro photo reply

[telscope@xxxxxxxxxx (Peter Abrahams)]

$  What I was curious about was the focusing of the scope with
$  the camera.  
It is very tricky to focus in the very dim light of night.  Use the brightest 
viewfinder screen you can get, and focus on the brightest object in 
the sky.  Use a t-ring on your camera, and get an eyepiece adapter
to fit in the telescope.  Of course you have an equatorial mount
and know how to guide your telescope, otherwise consult the readers of
sci.astro.amateur newsgroup.

$ I was going to take 3d photos of nearby stars and see what it looks like
$ using of course the earths rotation to give giant vision. 
This will not be possible, even the revolution of the earth around the sun is
nowhere near a large enough stereo base to allow stereopsis.  However, 
in one month the comet Hyakutake will  be speeding through the sky in
the vicinity of Polaris, a naked eye object possibly travelling at five degrees
a night.  This will allow stereo photography. {or false stereo, I still have not
digested R. Koolish's reply to my post of last month--the background isn't
moving, the photographer isn't moving, but one object in the field is moving.
What kind of stereo is that?}  I do not believe that even the brightest comet
could be photographed with a fast telephoto lens on a tripod, a tracking
telescope will probably be needed--but I hope I am wrong someday.
telscope@xxxxxxxxxx (Peter Abrahams)          
the history of the telescope, 
     the prism binocular, and the microscope


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