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Thread: 6.8 lens in a 5.6 shutter?

  1. #1

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    6.8 lens in a 5.6 shutter?

    I'm curious to know if the lens elements for a 210mm 6.8 lens can be used on a shutter meant for a 5.6 element lens? what would be the issues if any? Has anyone tried this with their lenses?

  2. #2

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    Re: 6.8 lens in a 5.6 shutter?

    If the threads match, and the spacing is correct, all you will need to do is get a new aperture scale.
    One man's Mede is another man's Persian.

  3. #3
    Jim Jones's Avatar
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    Re: 6.8 lens in a 5.6 shutter?

    If the focal length and lens design are similar, the aperture scale should work the same for both. Differences in lens design should usually make little difference. Considerable differences in focal length will require a new aperture scale or a correction factor.

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    Re: 6.8 lens in a 5.6 shutter?

    Okay, I have A Rodenstock Sironar-N 150mm 5.6 in a Electro Compur Shutter 1. Now the 210 elements are also Rodenstock although they're Geronar design. I'm being told that they would fit into a Copal 1 (which I assume is the same size as my shutter) so that would work right?

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    Re: 6.8 lens in a 5.6 shutter?

    Quote Originally Posted by mattydk View Post
    Okay, I have A Rodenstock Sironar-N 150mm 5.6 in a Electro Compur Shutter 1. Now the 210 elements are also Rodenstock although they're Geronar design. I'm being told that they would fit into a Copal 1 (which I assume is the same size as my shutter) so that would work right?
    Should. But you will need the aperture scale for the 210 elements, or a conversion chart.
    One man's Mede is another man's Persian.

  6. #6

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    Re: 6.8 lens in a 5.6 shutter?

    Thanks for the help

  7. #7
    Cordless Bungee Jumper Sirius Glass's Avatar
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    Re: 6.8 lens in a 5.6 shutter?

    I have the opposite problem: I have a Schneider Symmar-S f/5.6 210mm MC in a f/6.8 Copal N1 shutter. So can I assume that the lens wide open is f/5.6 and do an f/scale recalibration or is the wide open lens f/6.8 and I use the f/scale?
    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

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    Re: 6.8 lens in a 5.6 shutter?

    Quote Originally Posted by Sirius Glass View Post
    I have the opposite problem: I have a Schneider Symmar-S f/5.6 210mm MC in a f/6.8 Copal N1 shutter. So can I assume that the lens wide open is f/5.6 and do an f/scale recalibration or is the wide open lens f/6.8 and I use the f/scale?
    Open the shutter (with the preiew lever on the side) and close down the aperature.
    Look through the front of the lens and slowly move the aperture lever toward smaller numbers (open the aperture).
    When the aperture blades disappear, as seen looking through the front of the lens, the aperture is "wide open" - which is f/5.6 for your 210mm f/5.6 lens

    Does that make sense?

  9. #9
    Cordless Bungee Jumper Sirius Glass's Avatar
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    Re: 6.8 lens in a 5.6 shutter?

    Quote Originally Posted by BradS View Post
    Open the shutter (with the preiew lever on the side) and close down the aperature.
    Look through the front of the lens and slowly move the aperture lever toward smaller numbers (open the aperture).
    When the aperture blades disappear, as seen looking through the front of the lens, the aperture is "wide open" - which is f/5.6 for your 210mm f/5.6 lens

    Does that make sense?
    Yes, now I have to calibrate the f/stops and mark the shutter in a nondestructive way.
    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  10. #10

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    Re: 6.8 lens in a 5.6 shutter?

    Quote Originally Posted by mattydk View Post
    Okay, I have A Rodenstock Sironar-N 150mm 5.6 in a Electro Compur Shutter 1. Now the 210 elements are also Rodenstock although they're Geronar design. I'm being told that they would fit into a Copal 1 (which I assume is the same size as my shutter) so that would work right?
    Are you sure about your shutter size? My APO Sironar-N 150/5.6 is mounted in a Copal 0 shutter. My Caltar II-E (Geronar) 210/6.8 is mounted in a Copal 1 shutter.
    Never is always wrong; always is never right.

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