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Thread: Ektar 203 filter thread size..

  1. #1
    Roger William Barr
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    Ektar 203 filter thread size..

    I have a newly aquired Ektar 203 in a compur shutter, there is a thread for a filter. Anyone happen to know what size that would be..

    Thanks all

  2. #2

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    Re: Ektar 203 filter thread size..

    Mine dosen't have threads but uses a slip on series filter adapter (a Series VII, IIRC)
    I steal time at 1/125th of a second, so I don't consider my photography to be Fine Art as much as it is petty larceny.
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  3. #3
    LF/ULF Carbon Printer Jim Fitzgerald's Avatar
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    Re: Ektar 203 filter thread size..

    When I had mine I think it was 52mm. Great lens.

  4. #4
    Roger William Barr
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    Re: Ektar 203 filter thread size..

    No Jim, the outside diameter is about 38mm.. takes a 38 slip on series VI filter.. but I want to see if someone knows the internal thread size..

  5. #5
    IanG's Avatar
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    Re: Ektar 203 filter thread size..

    Kodak state they take a Series VI slip on filter also 33mm which seems to be the internal thread

    It may also depends which version US/UK.

    Ian

  6. #6
    Roger William Barr
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    Re: Ektar 203 filter thread size..

    That can't be right unless its referring to the mount 370 lenses sold a lot in the UK. The one I have measures 35.69 mm inside. I wonder if that means a 36mm thread..

  7. #7
    IanG's Avatar
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    Re: Ektar 203 filter thread size..

    That 33mm was from a 1945 US Kodak databook, OK it was for the 203mm f7.7 Anastigmat (earlier un-coated version), however I've just checked a later 4th Edition Dataguide and the Ektar is identical specification but coated.

    While mine's a Mount 370 UK made version (so non Supermatic - Epsilon, Prontor SVS, Compur #0 fully compatible) I'd agree at firts glance it appears to be closer to 36mm inside but theres a chamfer on the lip so the thread size does seem to be 33mm and I cut some card to33m and it's a tight fit across the internal diameter.

    Ian

  8. #8
    Roger William Barr
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    Re: Ektar 203 filter thread size..

    Well as I thought yours is a Mount 370. That one fits in a 0 shutter and is v.small. They made I think three different variations. The older ones that fit in a supermatic. (which have no threads) Then the newer ones like mine that fit in a compur #1 and those more common in Europe the Mount 370 that fits a #0 shutter often found in prontor or epsilon shutters. There is no way a 33 mm filter fits this lens as I said before it measures 35.69mm on the inside.

    Can anybody corroborate that a 36mm filter will fit ??

  9. #9
    IanG's Avatar
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    Re: Ektar 203 filter thread size..

    A quick Google search shows the US made 203mm Ektar in a different front and presumably rear barrel to adapt them to a Compur 1 shutter, so you're right that there's two US versions, the retaining ring for the front cell seems to be the same size. The filter size is definitely wider.

    Ian

  10. #10

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    Re: Ektar 203 filter thread size..

    I realize this is an old thread, but I am interested to know if a 36mm filter did indeed fit. I just acquired a Kodak Ektar 203mm f/7.7 in a Compur shutter, too, and I am looking for an appropriate screw-in step-up ring ...

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