Re: [APML] Taurus cameras

["John Boudreau" <jeboud@mediaone.net>]

----- Original Message -----
From: Bobby Middleton <bobm@koyote.com>
To: <astro-photo@seds.org>
Sent: Friday, January 18, 2002 4:47 PM
Subject: Re: [APML] Taurus cameras


> I guess I could get to my solution with a second approach than my first
> question. Can someone tell me the exact distance from film plane to the
> Lumicon newtonian E-Z guider's camera adaptor stop flange? With that
answer
> I can have the proper length tube machined for the C2 camera.
> Thanks,
> Bobby Middleton

If I understand what you're asking Bobby, you're talking about the film
plane distance to the point where the T-ring contacts the NEG's main body.
That distance *should* be 55mm. T-rings were originally designed to allow
use of some lenses on a variety of 35mm cameras, and these lenses were made
to work best at this 55mm film plane distance.

The film plane to the camera's bayonet flange of course varies from
make-to-make of the camera, most are around about 44 to 47mm. The proper
T-ring for each camera make is supposed to add the other 11 to 8mm, so that
together any given 35mm camera with proper T-ring would have a film plane to
front T-ring flange distance of 55mm.

However, you should measure your camera and T-ring accurately. I own a
Vivitar T-ring for an OM1 that's almost .5mm too long as it should be.

John Boudreau
jeboud@mediaone.net
http://people.ne.mediaone.net/jeboud/astro.htm



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