What Size Lens board? Beseler 45M?

mtbbrian

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• Oct 17, 2006

• #1

How do I know what size of lens board I need to get for my Beseler 45M?
I have never bought one before and need any information I can get.
Thanks!
Brian
Slowingly acquiring darkroom equipment....:rolleyes:

 

eric

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• Oct 17, 2006

• #2

I just got a Beseler 45M. It uses the same lensboard as my old 23C.

 

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mtbbrian

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• Oct 17, 2006

• #3

I guess my question is, should be is the opening size dependent upon the particular lens or do all lens have the same diameter or all or all lens threaded?
Brian

 

eric

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• Oct 17, 2006

• #4

mtbbrian said:

I guess my question is, should be is the opening size dependent upon the particular lens or do all lens have the same diameter or all or all lens threaded?
Brian

Click to expand...

Ohhhhh...depends on the lens. I'm facing the same situation right now and that's why I have another thread about using drill presses. Some 135mm lenses are 39mm 40mm, 50mm, 52mm yikes! Seems that (and I'm no expert), that most of the 105mm and under use the standard 39mm thread.

 

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mtbbrian

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• Oct 17, 2006

• #5

eric said:

Seems that (and I'm no expert), that most of the 105mm and under use the standard 39mm thread.

Click to expand...

That makes sense!
Thanks
Brian

 

Nick Zentena

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• Oct 17, 2006

• #6

If you're buying a lensboard the thing I'd suggest is looking for a 39mm threaded board. Most lenses will fit a 39mm opening. Almost anything shorter then 135mm is a 39mm mount. Even some 135mm lenses are 39mm mount.

With the threaded board you can leave it in the enlarger and just screw in the lens you need.

 

reellis67

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• Oct 17, 2006

• #7

For what it's worth, the 150mm El-Nikkor requires a larger hole than the standard 39mm, which makes it a pain to get used, and new is really expensive. The 80mm and 50mm El-Nikkors use the 39mm hole.

- Randy

 

Paul VanAudenhove

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• Oct 17, 2006

• #8

Beseler lensboards for the 45 series (and 23 series too, I believe) are roughly 4 inches square. You can make your own out of masonite and make the lens mounting hole any size you want. Most enlarging lenses use a standard 39mm mount, larger lenses use a larger mount as mentioned. Some older lenses use a 25mm mount. If you have a lens board now, you can use it as a template to make more. If you make your own, make sure that the material is not too thick so that there is not enough thread on the enlarging lens to attach the retaining ring.
Best of luck!

 

jeroldharter

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• Oct 17, 2006

• #9

Calumet Photographic catalogs have a nice table showing which enlarging lenses require which lens boards for which enlargers but I can't find it on line.