Re: [Leica] Enlarging lenses on screwmount cameras...

["Isaac Crawford" <isaacc7@home.net>]

- ----- Original Message -----
From: "Jem Kime" <jem.kime@cwcom.net>
To: <leica-users@mejac.palo-alto.ca.us>
Sent: Friday, October 13, 2000 4:35 AM
Subject: Re: [Leica] Enlarging lenses on screwmount cameras...


> Isaac,
> this is the sort of stuff that keeps me amused (pointlessly) for hours.
>
> At Photokina this year I stumbled across a firm that makes helical mounts
> for enlarging lens, especially Companons, the name: Schneider! You can
guess
> the price.
> Check out their macro range and see what they offer, of course you'll not
> know where it's focused until some tests are done. I use focusing screens
> which are like miniature ground glass screens from a view camera and were
> made for close up devices for Leica type cameras. Cook and Perkins,
> Periflex, Stewartry, several Japanese firms and I think Leica too, made
> these. they simply screw onto the rear of the lens and show whats in focus
> on the film plane.
>



Do you know of a supplier for these things? They sound like a blast!
> Of course you could probably buy a cheap old r/f coupled 50mm lens (like a
> Soviet Industar) and lose the optical cell. This way you'd stand a chance
of
> utilising the r/f focusing too. I found a cheap 50mm Elmar focusing mount
on
> ebay and have just passed that on to another Lugger here in the UK. I also
> have one from a DR Summicron, anyone got a spare optical unit?
>
.
>
> But hey! It's fun all right...

I'm going to take some test shots with my 50mm at different f/stops just to
see if anything is in focus... I'll try to get in touch with Schneider about
their focusing mounts...Thanx for the info!

Isaac
>
> Jem
>
> ----- Original Message -----
> From: Isaac Crawford <isaacc7@home.net>
>
> > OK, I know its a little weird, but I have some enlarging lenses sitting
> > around, and I have a IIIf... Does anyonw know of a helical mount that
> these
> > can fit into? I seem to dimly recall a product like this was offered at
> one
> > point, but damned if I can remember who did it. Actually, I'd be happy
if
> > these lenses (80mm companon-s and 50mm companon) focused at infinity. I
> > guess if the 50mm lens' focal point is located 50mm from the film plane,
I
> > would have infinity focus right? How would I go about measuring from the
> > focal point, or more to the point, how do I know where to measure from
on
> > the lens...
> >     Thanks for any info...aren't whims fun?
> >
> > Isaac
> >
>