Re: ATM Binocular collimation? part OT

["Joseph O'Neil" <joneil@multiboard.com>]

At 22:40 16/12/99 -0800, Andrew Grisdale wrote:

>My father has a seemingly excellent pair of Zeiss Jena 20x50 binoculars,
we used them terrestrially for years, leaning on our elbows on something of
course. When finally I got a bino clamp and put them on a tripod a couple
of years ago, turning them heavenward I was shocked to see two of
everything, the collimation was so off it made me dizzy trying to see
anything. Terrestrially this seems hard to notice, maybe the brain can more
readily match up more complex images. Anyway, this came to mind the other
day as I was looking at and through a pair of 7x40s in a store, that I
could have put on my christmas list, and with the store lighting being
diffused strip lights spaced real close, I realised I didn't have a hope of
telling whether the collimation on these was good enough for astro or not.
So, the question is, is there a simple in store way to check these things
reliably? 

-snip-

        there is a book writrten by the owner of University Optics (available form
them) call "Choosing, Using and Repairing Binoculars".   For anyone who is
ATM minded, it continas complete insturctions on how to recollimate
binoculars, if you are up to the task.
        I would reccomend the book if you are thinking of doing it yourself.
joe


http://www.oneilphoto.on.ca
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