G Claron 240mm f9

[Jack the boatman]

Hello,

I have a G Claron 240mm f9 lens without a shutter but with an aperture scale. All the information I can find says that the required shutter is a Copal 1.

I also have a Fujinon W 210mm f 5.6 with what I think is a Copal 1 shutter.

The rear element of the G Claron fits the rear of the Copal 1? shutter, but the front element of the G Claron does not fit the front of the Copal shutter.

Can anyone explain?

Thanks

Jack

[Jody_S]

I have recently fit a 240 G-Claron, older-style Dagor design (52mm front filter thread), into a Compur #1. The cells screwed right in but the thickness was off (I had to cut 2.4mm from the shutter, IIRC). I had several #1 shutters on hand, the cells fit in all of them. I've never had a newer-style G-Claron, but from the pics it looks like the front cell may be larger?

[Dan Fromm]

Look here http://www.skgrimes.com/products/new...standardcopals for dimensions of Compur/Copal standard #0, #1 and #3 shutters.

Jack, I take it that your G-Claron is in barrel. Is this the case? What is the problem with the front cell? Too large, too small?

[Jack the boatman]

Look here http://www.skgrimes.com/products/new...standardcopals for dimensions of Compur/Copal standard #0, #1 and #3 shutters.

Jack, I take it that your G-Claron is in barrel. Is this the case? What is the problem with the front cell? Too large, too small?

Dan,

Thanks for your reply, your web site reference is very useful. I'm afraid I can't consider $585 dollars though.

The front cell of the lens is a smaller diameter than that of the shutter from the Fujinon.

I'm not sure if it is in a barrel, I don't think so, I've never seen a barrel lens. The two parts of the lens separate in the same way as my Fujinon and also a super Angulon 65mm. The lens has its own aperture and scale.

I hope this helps

Jack

[Dan Fromm]

Jack. look here http://www.ebay.com/itm/Schneider-G-...-/190809947746 to see a G-Claron in barrel. Is this your lens?

Measure the outer diameter (across the threads) of your lens' front cell and the inner diameter (again across the threads) of your Fujinon's shutter. And tell us.

I sent you to SKGrimes to get dimensions to check against the lens and shutter you have in hand, not to suggest that you buy a shutter.

[JimL]

If your Fujinon 210 is the older style in a Seiko shutter, the shutter may not be a Copal No. 1 size. It seems that, early on in this lens' production, Fujinon used a shutter size with larger front threads which don't correspond to any of the other standard shutter sizes.

[Jack the boatman]

Dan,

Yes that is my lens.

Sorry, I wasn't assuming you were suggesting I buy one of the Grimes shutters, I was just a bit surprised at the price. I think I only paid about £40 for the lens as it is. I have turned a wooden lens cap, with a view to using it at 1 sec or longer exposures, but it would be better if I could find a reasonably priced shutter.

Thanks again

Jack

[Jack the boatman]

Dan,

I will check the dimensions you suggest and let you know, but it will be Wednesday before I can do that.

Jack

[Jack the boatman]

Jack. look here http://www.ebay.com/itm/Schneider-G-...-/190809947746 to see a G-Claron in barrel. Is this your lens?

Measure the outer diameter (across the threads) of your lens' front cell and the inner diameter (again across the threads) of your Fujinon's shutter. And tell us.

I sent you to SKGrimes to get dimensions to check against the lens and shutter you have in hand, not to suggest that you buy a shutter.

I have measured as you suggested Dan and the results are:

Across the threads of front element of the Claron lens 38mm

Across the threads of the Copal shutter 39mm.

I have also discovered that the front part of the lens can be separated from the aperture ring part, and this screws into the Copal shutter.
This could give me a usable lens/shutter but with no aperture control.

This raises another issue in my mind. When the lens is used for its original purpose in its barrel, the distance between the front and rear parts of the lens must be as the designer wants it. If it is fitted to a shutter, is there any guarantee that this relationship will still be optically OK?

On the Grimes diagram for the Copal 1 there is a measurement of M39. I am not sure however if this is the dimension I'm looking for, but it does tie in with my measurement.

Jack

[Andrew]

sounds like you tried leaving the front lens cell in the barrel mount and then screwing the whole barrel into the front of the copal shutter?
you've just discoveres that you need to remove both lens cells fron the barrel and then screw them into the shutter

if it's a normal shutter the copal already has an aperture in it and all you need to do is calibrate it to the new lens
you should post a couple of pics of the shutter and if someone has the same lens/shutter combination they may be able to scan the aperture scales which would give you a big headstart