Sinar lens board

[Flack]

I have a Sinar lens board with a Rodenstock Siron-N F135mm MC lens attached, can I remove the lens from the board and get a shutter for it to use on my other 617 camera?. I think its a copal 0 size.

 

[MartyNL]

In short, yes.

 

[Flack]

Any idea on what to look for I think its a 39mm thread size on the front and rear lens.

I have another 150mm Rodenstock lens and I can remove both front and rear elements and the elements from the 135mm fit and it looks like it works, I can focus it on my camera, but I have read that the apertures are calibrated for each lens focal lenght.
I might just bite the bullet and try a test shoot and see what I get with it.
If it works I can just swap the elments when needed in the short term untill I can find a shutter, or another lens and shutter with bad elements.

 

[Petrochemist]

Any idea on what to look for I think its a 39mm thread size on the front and rear lens.

I have another 150mm Rodenstock lens and I can remove both front and rear elements and the elements from the 135mm fit and it looks like it works, I can focus it on my camera, but I have read that the apertures are calibrated for each lens focal lenght.
I might just bite the bullet and try a test shoot and see what I get with it.
If it works I can just swap the elments when needed in the short term untill I can find a shutter, or another lens and shutter with bad elements.

Apertures are indeed dependent on focal length, as f numbers are defined as diameter of the opening divided by focal length. If you use marking for a 135mm lens with a 150mm all the f-numbers will be about 10% (150/135 is 1.111..) higher than shown (ie slightly slower)

For most shooting the difference here will be negligible as it's only around 1/3 stop

 

[Ian Grant]

Both the 135mm & 150mm Sironar N lenses fir a Copal or Compur #0 shutter. You might find a cheap135mm f4.6 Xenar in a Compir #0 shutter, the aperture scale will be correct.

Not all Sinar DB lenses can be swapped into a normal shutter, but I think the Sironar should be fine.

Ian

 

[Flack]

Both the 135mm & 150mm Sironar N lenses fir a Copal or Compur #0 shutter. You might find a cheap135mm f4.6 Xenar in a Compir #0 shutter, the aperture scale will be correct.

Not all Sinar DB lenses can be swapped into a normal shutter, but I think the Sironar should be fine.

Ian

Ian would this shutter fit the lens elements

Schneider Kreuznach Xenar 135mm Synchro-Compur-P Shutter​

 

[Ian Grant]

Yes, but you should be able to find one for about 1/3rd that price.

Ian

 

[David M]

Is the lens not mounted in a shutter already?
You should be able to remove it from the board, although retaining rings can sometimes be very stiff. You might need to get the special tool.

You also should be able to find a used shutter although they are now becoming scarce. Nobody is making shutters now, except for Intrepid Cameras in Brighton who are developing a new shutter. It will eventually be launched on Kickstarter, so you’d need to watch out for it.

The Intrepid Lens & Shutter Project

I want to tell you a little bit about something we have been working on for the last year or so, something I think you are going to really like.

intrepidcamera.co.uk

 

[Ian Grant]

Is the lens not mounted in a shutter already?

The lenses on Sinar DB lens boards don't have a shutter, they are used mounted on the front of Sinar Copal shutters. The DB board incorporates the aperture. Lenses mounted on DB boards are actually quite cheap on eBay.

Ian

 

[David M]

Thank you. I’d missed that in the original post.

 

[David Lindquist]

That the lens in question is mounted on a DB board is not, in fact, in the original post. My initial thought was what's going on here, then surmised that the lens was set-up for use with the Sinar behind-the-lens shutter and therefore didn't have its own.

Makes sense that DB mounted lenses would be cheaper as a buyer would either need a Sinar (or Sinar-compatible) camera and Sinar Copal shutter or would have to find a shutter to fit. With the latter there could be the issue of a shim being needed for optimum performance.

David

 

[David M]

That must be how I missed it.

 

[Ian Grant]

It needed a little lateral thinking to assume a DB board, there are two versions. Early Sinar Copal shutters didn't include aperture control, the later Sinar Copal Auto Aperture shutter, and Digital did, as did the later Expolux shutters. In all cases the aperture os an intregal part of the DB mount

I bought a Compur #0 shutter yesterday for under£15 inc postage, I have quite a few NIB shutters #00. #0, & #1. I've been collecting shutters for quite a few years now, many unusual, rare, or prototypes.

Makes sense that DB mounted lenses would be cheaper as a buyer would either need a Sinar (or Sinar-compatible) camera and Sinar Copal shutter or would have to find a shutter to fit. With the latter there could be the issue of a shim being needed for optimum performance.

David

I've only ever seen shims with wide angle lenses, 90mm and shorter, where cell spacing is way more critical. The late Dean Jones who made Razzledog 5x4 Polaroid conversions found that the issue with unsharp early 90mm f6.8 Angulon lenses and was inconsistent Barrel lengths of the Compur shutters. Pre SN 5 million (1957) 90mm Angulons were hit and miss in terms of getting a sharp one. Linhof would take a complete batch and test and select only the best.

Dean would check the barrel length and if necessary strip the shutter and machine the barrels to the correct length, he found this corrected the sharpness issue. I bought a 90mm Angulon in the mid to late 1980s, and it was soft, I tried another which was similar. Years later I acquire a much later version which was fine.

Ian