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Thread: Commercial Ektar 12" coverage?

  1. #1

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    Commercial Ektar 12" coverage?

    Hello,

    I'm putting together my first 8x10 kit, and am looking for a lens. The Commercial Ektar 12" is one I've seen available, and has been recommended to me. However, I read somewhere (can't remember where now) that it only has 56 degrees of coverage, which would mean it won't cover 8x10 when focused at infinity. However, when I stopped by Catlabs recently, the guy there was sure it would work. I need it to cover at infinity, as I shoot landscapes, so if anyone knows which is correct, it would be appreciated.

  2. #2
    Pastafarian supremo Rick A's Avatar
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    Re: Commercial Ektar 12" coverage?

    The Kodak Reference Handbook lists the 12" Commercial Ektar as an 8x10 lens.
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  3. #3

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    Re: Commercial Ektar 12" coverage?


  4. #4

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    Re: Commercial Ektar 12" coverage?

    Thanks for that source! If it is correct, the lens will work for me.

  5. #5
    Corran's Avatar
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    Re: Commercial Ektar 12" coverage?

    It's a Tessar lens. You can count on all Tessar lenses covering a bit more than their focal length. Therefore, a 12 inch Tessar will always cover 8x10, regardless of maker.

    Also, you might be a bit confused on the degrees of coverage and what that translates to in image circle.
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  6. #6

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    Re: Commercial Ektar 12" coverage?

    Quote Originally Posted by Ethan View Post
    Hello,

    I'm putting together my first 8x10 kit, and am looking for a lens. The Commercial Ektar 12" is one I've seen available, and has been recommended to me. However, I read somewhere (can't remember where now) that it only has 56 degrees of coverage, which would mean it won't cover 8x10 when focused at infinity. However, when I stopped by Catlabs recently, the guy there was sure it would work. I need it to cover at infinity, as I shoot landscapes, so if anyone knows which is correct, it would be appreciated.
    It definitely covers 8x10 with quite a bit of room to spare. Its a fantastic lens, rendering out-of-focus areas beautifully. Its one of my favorite lenses.

  7. #7

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    Re: Commercial Ektar 12" coverage?

    12" f6.3 Commercial Ektar was designed for 8x10, 53 degrees at f6.3 and 64 degrees at f16. It is not just a Tessar, it is a very, very carefully designed and made Tessar with low dispersion Lanthium glass with excellent color correction. The color balance was originally intended for Kodachrome color transparency films. They have excellent definition and resolution with lower contrast and excellent tonal and contrast rendition on film, mostly opposite of the high contrast look of modern multi coated Plasmat and similar lenses. The other goodness of these Kodak Ektars is their out of focus rendition.

    https://www.pacificrimcamera.com/rl/00346/00346.pdf

    One of my all time fave LF lenses for all sheet film formats. Your specific lens may and can vary in actual performance, do the required lens testing to verify if the specific example is any good before accepting.


    Bernice

  8. #8
    Nodda Duma's Avatar
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    Re: Commercial Ektar 12" coverage?

    I am currently using this exact lens on my 8x10. Here is an example result from 2 weekends ago (pardon the jpg compression)

    Click image for larger version. 

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    Another result on Provia 100

    Click image for larger version. 

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    Newly made large format dry plates available! Look:
    https://www.pictoriographica.com

  9. #9

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    Re: Commercial Ektar 12" coverage?

    hmm, I'm confused now. If it has only 53 degrees of coverage wide open, if my math is correct, then it only has an 11.97" image circle at 6.3, which is different than the 380mm listed by that site, and 11.97" is less than the diagonal of 8x10 (12.8")... have any of you with this lens focused at infinity with it?

  10. #10

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    Re: Commercial Ektar 12" coverage?

    Ethan, modern, not ancient, f/4.5 Tessars cover ~ 110% of their focal length when stopped down. f/6.3 Tessars cover ~ 65 degrees stopped down. If you want to shoot wide open, no modern 12" lens of normal construction (in this case, not wide angle) will cover 8x10.

    People have been using 12"/6.3 Commercial Ektars on 8x10 with good results ever since the lens was introduced. Stop being so afraid of making a mistake. If the price is right, get the lens and don't look back. If you can't master your fear, get a 12" plasmat type.

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