[LargeFormat] Compur #1 and Copal #1 for G-Claron 305mm f9

[Lee Carmichael]

I have a 305 G-Claron and I got it as a barrel lens also.  I ripped a funky
210 out of the copal #1 and just screwed the front element and the back
element into the proper places and made a lens board and then sent the whole
thing to Steve Grimes and he cut me a new plate for the f/stops and sent it
back for $35 dollars plus shipping.  Took longer in shipping than it did to
do the job.  About 10 days total.  (Me shipping it up and him doing the job
and then shipping back to me)  I don't use my lens a lot but it is the
longest lens I have.  But is very sharp and has good contrast.  I did not
use any shims when mounting the lens to the shutter.

lee
----- Original Message -----
From: "Michael Briggs" <MichaelBriggs@Earthlink.net>
To: <largeformat@f32.net>
Sent: Tuesday, January 22, 2002 12:54 AM
Subject: RE: [LargeFormat] Compur #1 and Copal #1 for G-Claron 305mm f9


>
> On 22-Jan-02 Clive Warren wrote:
> > Am now a very happy bunny :-)  Just picked up a 305mm f9 G-Claron in
> > barrel at a very reasonable price and also have a spare Compur #1
> > sitting here waiting for it.
> >
> > My question is to all those of you who may have the lens in a Copal
> >#1 shutter which is what they are usually supplied in from the
> > factory. What is the width of the shutter between front and back for
> > the lens elements and are there any spacing rings used on the
> > elements?
>
> It will likely work by directly screwing into any reasonably modern #1
shutter.
> If you can measure accurately, measure the total length of the lens in the
> barrel and in the #1 shutter.  If they are the same, it is ok.
>
> According to a datasheet that I have, and confirmed with a measurement,
the
> thickness of a Copal #1 press shutter is 20.000 +/- 0.025 mm.  This is the
> distance from the front edge of the thread for the front cell to the back
edge
> of the thread for the rear cell.  The other mechanical specs are quite
tight:
> these two surfaces are to be parallel to 3 arc min and the centers of the
> threads aligned to 0.03 mm.
>
> S.K. Grimes has drawings of Copal shutters with measurements on his web
site.
>
> --Michael
>
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