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  1. #1
    eric's Avatar
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    5/8" extension on Beseler lensboard?

    Why is there a product with a 5/8" extension on a Beseler lensboard? It says its for a 105 and 135mm. I have a 105mm and it seems fine. I just got a 135mm lens and was wondering if I need a regular lensboard or a 5/8" extension lensboard.

  2. #2

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    For reductions? You got a model number for that board?

  3. #3
    eric's Avatar
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    Quote Originally Posted by Nick Zentena View Post
    For reductions? You got a model number for that board?
    This one

    http://www.bhphotovideo.com/bnh/cont...ughType=search

    It says its for 105-135mm lenses.

  4. #4

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    I bet it's mostly aimed at the 23 model more then the 4x5s.

  5. #5
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    Quote Originally Posted by Nick Zentena View Post
    I bet it's mostly aimed at the 23 model more then the 4x5s.
    I sort of found something on the innernet (so it must be true right? ) that the extension is used for some lenses that have a large rear element. So I'm guessing, that some o fthe bigger lenses with 39mm thread, have that feature. I think you are right though, on the 23c, the focus rail stops short.
    So let say that I won this on the auction site cheap, I put my 135mm on it, and use it for 4x5 negs, perfectly okay right? I just need to raise the enlarger 5/8" inch more I guess.

  6. #6

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    Only problem would be when you want to make a max size enlargement. You'll be giving up some size at the top end. But if you aren't making 24x24 [or whatever the top size is] I doubt you'll notice.

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    Actually I take that back. Considering you can focus a 50mm with a flat board the extension won't matter even with a max enlargement.

  8. #8
    eric's Avatar
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    Quote Originally Posted by Nick Zentena View Post
    But if you aren't making 24x24 [or whatever the top size is] I doubt you'll notice.
    Doesn't everyone make 24x24?
    I can barely make a nice 8x10

  9. #9
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    You will find one also that is recessed...
    Patrick

    something witty and profound needs to be inserted here...



 

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