Re: [APML] Taurus cameras

["Bobby Middleton" <bobm@koyote.com>]

I've heard that 55mm before. That's the distance from the film plane to the
very end of the T-ring correct (and back of the OAG)?
Thanks John,
Bobby



From: John Boudreau <jeboud@mediaone.net>
> 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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