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  1. #1

    Compur shutter questions

    Hi all

    New(ish) to the forum and enjoying the hive mind very much.

    Iím about to pull the trigger on a Schneider Xenar 15cm f/3.5 that comes with a working Compur shutter (old model, not Synchro-Compur model). Iíve searched the web for specifications but still have some questions. Hoping anyone familiar with Compurs can help!

    1. Is the maximum speed 1/200?

    2. What do the letters B, T, Z, D, M stand for on the dial? Which setting is used for regular use? (assuming B is Bulb and T is Timed exposures).

    3. Does it have preview switch and cocking lever like modern shutters?

    4. Do Compur type numbers correspond to Copal, ie. does a Compur No. 1 fit in a Copal No. 1 lens board?

    Thanks in advance.


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  2. #2
    Ron (Netherlands)'s Avatar
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    Re: Compur shutter questions

    Most reliable German shutter made by Friedrich Deckel:

    I - B - T : Instantaneous - Bulb - Time
    M - D - Z: Moment - Dauer - Zeit

    Maximum speed depends on the size of the shutter, but for a 15cm lens it could be 1/200 sec.

    some sizes of the old Compur:
    http://lostlabours.co.uk/photography...s/compur-1.jpg

    Here you find info on most different compur and compound shutters:
    http://www.tontrennung.de/assets/doc...ur_shutter.pdf

    Others could answer your question about Copal - seems they have different measures.
    Last edited by Ron (Netherlands); 23-Nov-2021 at 08:52.
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  3. #3

    Join Date
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    Re: Compur shutter questions

    This is a prewar lens with a prewar shutter.
    IBT and ZDM is English and German.
    Set the dial to Z and activate to view, or a locking remote on B.
    Dial to I and shutter will work on the times.
    Do show us a picture!
    Mine f3.5 is nice and sharp, though a bit more heavy than a modern Copal #0.
    Same shutter measurement as my 8x10" 159mm wollensak, so lens elements are mostly in the drawer
    Last edited by Oslolens; 23-Nov-2021 at 03:16. Reason: Not correct.

  4. #4

    Re: Compur shutter questions

    Quote Originally Posted by PunkFunkDunk View Post
    1. Is the maximum speed 1/200?
    If it says so. The smaller Compurs 1/250. They are probably a little slower than that by now, but you can still treat them as they are correct.

    2. What do the letters B, T, Z, D, M stand for on the dial? Which setting is used for regular use? (assuming B is Bulb and T is Timed exposures).
    Yes, B = Bulb, T = Time. M = Moment. (D = Dauer, Z = Zeit in German).

    3. Does it have preview switch and cocking lever like modern shutters?
    You open the shutter on T for focusing, then close it. Then set it to M and cock the shutter, and you are ready. You can set the aperture while focusing or after closing the shutter.

  5. #5

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    Re: Compur shutter questions

    To emphasize- you do not cock the shutter on T.

  6. #6

    Re: Compur shutter questions

    Quote Originally Posted by j.e.simmons View Post
    To emphasize- you do not cock the shutter on T.
    True, nor on B.

    Many of them have coated paper aperture leaves, so be careful if you try to clean the shutter.

  7. #7

    Re: Compur shutter questions

    Thank you kindly for the useful information. Here are some pics of the lens I just bought.


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  8. #8

    Join Date
    Feb 2019
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    Re: Compur shutter questions

    It looks to be missing a retaining ring or flange for mounting. I’ve bought a number of lenses recently where I forgot to notice whether it has a ring. In those cases, I’ve got a new ring from SK Grimes, but it does add to the cost a bit.

  9. #9

    Re: Compur shutter questions

    Quote Originally Posted by abruzzi View Post
    It looks to be missing a retaining ring or flange for mounting. Iíve bought a number of lenses recently where I forgot to notice whether it has a ring. In those cases, Iíve got a new ring from SK Grimes, but it does add to the cost a bit.
    Yes, I had noticed that. Iíll have to wait for the lens to be delivered to me since I donít know if this particular Compur is equivalent to Copal 0 or 1 size.


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  10. #10

    Join Date
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    Re: Compur shutter questions

    Quote Originally Posted by abruzzi View Post
    It looks to be missing a retaining ring or flange for mounting. I’ve bought a number of lenses recently where I forgot to notice whether it has a ring. In those cases, I’ve got a new ring from SK Grimes, but it does add to the cost a bit.
    If I read the photo correctly the front cell's side is engraved Xenar 1:3/5 F - 15 CM. If so, the shutter is larger than a #1. Best to wait until you have it in hand, then measure. In the worst case, if you can't find a metric thread gauge, you'll have to send the shutter to skgrimes. Here's a link to their retaining rings and flanges page: https://skgrimes.com/products/mounting-flanges/

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