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Thread: Are Compur Electronic 3 shutter threads same as Copal 3?

  1. #1
    NCAmother's Avatar
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    Are Compur Electronic 3 shutter threads same as Copal 3?

    I'm looking for a new shutter to replace the compur 3 electronic shutter, is the copal 3 compatible? Thank you,
    Nathan

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    Yes.

    Though you'll need to consider the lens you're transferring. Many Schneider lenses that were originally designed for Compound #3's were later used in Compur Electronic #3's still kept the same threads, but had a nearly-impossible-to-remove brass thread adapter installed from Compound #3 to Compur/Copal #3.

    This is the case for the 300mm f/5.6 Symmar, for example.

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    The lens is a 21cm Heliar

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    The threads on the front cell measure 56mm, I have yet to remove the rear cell

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    My 21cm Heliar is in now in a Copal 3S after removing it from its original barrel.

    That information may not be relevant for your case.

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    Quote Originally Posted by Len Middleton View Post
    My 21cm Heliar is in now in a Copal 3S after removing it from its original barrel.

    That information may not be relevant for your case.
    Thank you. So are my shutter options Copal 3s and compound 3? If so, what are some lenses for me to keep an eye out that will have interchangeable shutters?

  7. #7

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    Quote Originally Posted by NCAmother View Post
    The threads on the front cell measure 56mm, I have yet to remove the rear cell
    56mm smells like a #3S to me.

    http://skgrimes.com/products/new-cop...standardcopals

  8. #8

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    As per our Displaced Canadian's link to the SKGrimes site, it looks like it might be a 3S...

    This is where it gets interesting...

    I just pulled mine out of the bag and can verify there are no marking on the nameplate that indicates it is a Copal 3S shutter, although I know it is. The nameplate says "COPAL - NO.3". So without holding one in your hand with the appropriate measuring tools, you would not know.

    As far as finding lenses mounted in a Copal 3S, I would assume the Copal 3S was an opportunity for Copal to captures part of the market vacated when Compound shutters no longer were available, through what looks to be a change of the tube of their standard product, even to the point of using the same nameplate.

    You might want to look at German lenses of certain vintage (older 210mm f4.5 Xenar or others?) or funky Japanese lense in the same focal length / lens speed.

    Just spitballing here until you can find someone who really knows for certain...

    Good luck

  9. #9

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    Re: Are Compur Electronic 3 shutter threads same as Copa 3?

    I have one, it seems that there might be some adapter between the lens and the shutter. I could be wrong, but I remember asked bout it here long time ago. Can you post some photos?
    Quote Originally Posted by NCAmother View Post
    The lens is a 21cm Heliar

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