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  1. #1

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    Question about being able to use 6x7 carrier, 135mm lens on bessler 45

    I currently have a Beseler 45 with a 135mm lens that I use to make prints from 4x5 negatives. I am in the process of purchasing a 6x7 negative carrier. Will I be able to use the 135mm lens for making prints from 6x7 negatives or will I need to get a 90mm lens like the Beseler manual says. I would like to make 8x10 to 16x20 enlargements.


    Thanks

  2. #2
    markbarendt's Avatar
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    You betcha by golly!
    Mark Barendt, Beaverton, OR

    "We do not see things the way they are. We see things the way we are." Anaïs Nin

  3. #3
    MattKing's Avatar
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    You may have trouble making a 16 x 20 enlargement. The 135mm lens doesn't magnify as much as a 90mm lens, so you may run out of column height before your projected image is large enough to fill a 16 x 20 sheet of paper.
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  4. #4

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    Thanks that answered my question.

  5. #5

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    Comparison of magnifications of enlarging lenses of different focal lengths

    The shortest lens that is specifically designed to fully cover the format will give the greatest magnification.

    The usual 6 x 7cm-specific lenses are 90mm—the so-called “normal” focal length.

    Too, most modern 80mm lenses are designed to fully cover the 6 x 7cm format.

    The 60mm f/4 Rodagon WA is a wide-angle enlarging lens designed to cover 6 x 7cm.

    With a 1000mm negative-to-print distance, for the stated focal lengths we get the following magnifications:

    135mm, 5.2X

    90mm, 9X

    80mm, 10.4X

    60mm, 14.6X


    The 16” x 20” print has aspect ratio length/width = 5/4 = 1.25

    At a 1000mm negative-to-print distance, the largest 5/4 projection cropped from a 6 x 7 cm negative using each focal lenght lens is:

    135mm, 11.3” x 14.1”

    90mm, 19.6” x 24.5”

    80mm, 22.7” x 28.4”

    60mm, 31.8” x 39.8”

  6. #6

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    with the 135mm lens I run out of column before I get to 11x14

    Just got my 6x7 negative carrier. 8x10 covers fine with my 135mm lens. I run out of column height before I get full coverage on 11x14.

    Now I need a Beseler 45 lens board and a 90mm lens with a 39mm diameter mount. Where can I find one? I checked Ebay and there is only one 90mm enlarger lens listed.

  7. #7

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    It will work in general, because it covers the film, but you will not be able to print 16x20's. I'd try a 90 or 100/105. Enlarger lenses are cheap on the used market. I would lurk in the classified section here for a while. They come up pretty frequently. E-Bay is an option as well, of course. Just follow the normal precautions. Ask lots of questions, and get lots of good photos until you are satisfied, then make sure that you have a good return contract with the seller.
    Last edited by 2F/2F; 03-25-2011 at 12:28 AM. Click to view previous post history.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  8. #8
    MattKing's Avatar
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    Quote Originally Posted by ke6igz View Post
    Just got my 6x7 negative carrier. 8x10 covers fine with my 135mm lens. I run out of column height before I get full coverage on 11x14.

    Now I need a Beseler 45 lens board and a 90mm lens with a 39mm diameter mount. Where can I find one? I checked Ebay and there is only one 90mm enlarger lens listed.
    Many high quality 80mm lenses will cover 6x7. 105mm lenses will probably give you 11x14.

    I'd start a thread here on APUG asking who successfully uses which 80mm lenses for 6x7.
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  9. #9

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    There is another trick with that enlarger that you can use so you do not have to buy another lens. It is a bit of a process, but it works. You can raise the enlarger by putting blocks underneath each side of the base rails. Then remove the baseboard and print on the table. The problem, if this is a temporary setup done with imprecise blocks such as 2x4s, is alignment. After you rig it up on the blocks and test to make sure you have enough enlargement, you might need to use some shims for the blocks – strips of card stock will work fine – and a way to test your alignment. I use a grainy negative to fix my B22 when it inevitably slips out of alignment every now and then. (They are cheap enlargers. Yours is much better; once set up properly, it will rarely, if ever, go out of alignment, and if it does, it is easy to adjust.)

    With this enlarger, you can also very easily tilt it backward for horizontals. If you have a rolling metal filing cabinet, you can use magnets to hold your paper in place there. Again, with a temporary setup, alignment is a pain, but it can be done.

    Ideally, you have a special table with two shelves (top one removable) set up permanently. When using the top for normal printing, the bottom serves as a storage shelf for your paper, proofer, etc. When printing big, take the top shelf off and the bottom shelf serves as your baseboard.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

  10. #10

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    measured distance from neg carrier to enlarger baseboard at full column height

    Measured the distance from neg carrier to enlarger baseboard at full column height and its about 35 inches or 890 mm. So that explains why I can't get to 11x14 with a 135mm lens. What is the formula used to calculate the magnification factors? I could then figure out what focal length lens I would need to get me to 16x20 size enlargements. Of course a 90mm would be ideal but they seem to be hard to find in the used market.
    Last edited by ke6igz; 03-25-2011 at 04:02 AM. Click to view previous post history.

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