Lens board question

[Bigdaddyg]

I have a camulet 4x5 and a 5.6/150mm Scheinder symmar-2 lens. The issue I have is it fits in a lens board that the hole is only 29mm in diameter. It is my understanding the Copal 0 is 35mm yet my lens board is only 29mm. The threaded area that fits in the hole is only 27mm I want to use this lens in a Sinar but I can not find a lens board at that size. Anyone know of alternatives and why this lens has such a small diameter?

Greg

 

[Dan Fromm]

I have a camulet 4x5 and a 5.6/150mm Scheinder symmar-2 lens. The issue I have is it fits in a lens board that the hole is only 29mm in diameter. It is my understanding the Copal 0 is 35mm yet my lens board is only 29mm. The threaded area that fits in the hole is only 27mm I want to use this lens in a Sinar but I can not find a lens board at that size. Anyone know of alternatives and why this lens has such a small diameter?

Greg

I hope you're talking about the shutter's diameter, not the lens'. Shutter specifications are here: http://www.skgrimes.com/products/new-copal-shutters/standardcopals Correct your understanding.

 

[Bigdaddyg]

Actually I am talking about the threaded area where the retainer fastens at the back of the lens. It is too small for a 35mm hole in a copal 0 board. With the retainer ring on the back it just slips through.

 

[Dan Fromm]

If you mean Symmar-S (I'm not sure there is a Symmar-2), according to Schneider's data sheets, depending on the year the lens was made it will be in a #0 or a #1 shutter. #0 in the 1972 data sheet, #1 in 1992.

You said Copal 0. Is that the shutter the lens is in? What identifying markings are on the front of the shutter? What identifying markings are on the front of the lens?

And, most important, what are you measuring and how? I ask because there is no Compur/Copal standard shutter with a 27 mm (internal diameter) retaining ring. #00 is 25 mm, #0 is 32.5 mm and #1 is 39 mm. What you're describing should not exist. The hole in the board is larger than the shutter's rear tube (that the retaining ring goes on) to let it accept the retaining ring's centering ridge.

You may (great stress may) be looking at the lens' rear cell. If the lens is in a #0, its front and rear cells mounting diameters will be 29.5 mm. In which case, you've unscrewed the rear cell from the shutter and left the shutter attached to the board. There will be a retaining ring on the shutter's rear tube that holds the shutter to the board. If so, unscrew it (you may need a spanner to do this; needle nose pliers will work but using them is very bad practice), remove the shutter and then measure the hole in the board.

Please learn the language. Lens and shutter don't refer to the same thing.

 

[Bigdaddyg]

Thanks Dan,
After much digging the problem is that it is a Copal #00 not #0. The exterior was 27mm and the interior is 25mm. The lens board hole was 29mm. Sorry if I confused you I tried to describe it the best I could. Unfortunately these boards are no longer made. Im going to see if SKGrimes can make one for me.

Greg

 

[Jon Shiu]

You can get an adapter retaining ring that adapts the 00 shutter to 0 size hole. Ebay. Or skgrimes or any other machine shop can bore the correct hole for you in a blank board.

Jon

 

[ntenny]

It seems like it should be possible to find a used lensboard drilled for #00; I'd check KEH first and eBay second before paying up for a new one. I'm not sure what Calumet model you have or what the board specs are, but it might be worth while to get an adapter to use Technika boards, which are cheap and abundant in all sorts of sizes.

-NT

 

[Dan Fromm]

Thanks Dan,
After much digging the problem is that it is a Copal #00 not #0. The exterior was 27mm and the interior is 25mm. The lens board hole was 29mm. Sorry if I confused you I tried to describe it the best I could. Unfortunately these boards are no longer made. Im going to see if SKGrimes can make one for me.

Greg

I don't ask questions idly. When I ask, please answer fully. Ain't no Symmar-2. Symmar-S, yes, Symmar-2, no. What identifying marks are engraved on your lens' trim ring? As far as I know Copal never made a #00 shutter. Do you have a Compur or a Prontor Press shutter? Schneider never cataloged a Symmar (jes' plain Symmar or with a suffix) of any focal length in #00 shutter. WHAT THE #### DO YOU HAVE?

 

[ntenny]

Camerapedia says there are at least two versions of Copal 00, with 5 and 3(!) blades. No source cited, and Google turns up no pictures of actual examples; maybe it's a mistake, or maybe they were made only for some odd application.

I can't see how a 150/5.6 plasmat would fit in a #00 shutter, but the OP's measurements do sound like that size. I'd like to know the answers to Dan's questions as well; it seems like the lens may be misidentified or not all there, or perhaps adapted to an unusual mounting.

OP, what *exactly* do you have? If the lens is complete and in shutter, there should be a front portion and a rear portion, which thread onto the shutter separately.

-NT

 

[shutterfinger]

27mm is the correct OD for a 00 shutter. A lens board with a 27mm hole is said to have a "pilot hole". Look for a board listed as having a pilot hole or get an adapter for the spare board you have. They are easy to make from common materials with common tools such as a drill and hole saw.