Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18

Thread: Can lenses in Sinar DB mount be remounted in copal shutters?

  1. #11
    mortensen's Avatar
    Join Date
    Jul 2009
    Location
    Copenhagen, Denmark
    Posts
    451

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    thanks again - so helpful!

  2. #12
    come to the dark s(l)ide..... Carsten Wolff's Avatar
    Join Date
    Jul 2004
    Location
    Australia at the moment
    Posts
    458

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    Quote Originally Posted by mortensen View Post
    thanks again - so helpful!
    ... What Bob said: Don't forget to mention which focal length that scale is for, not just the max aperture.... SKGrimes and others can also make/send you matching scales.
    http://www.jeffbridges.com/perception.html "Whether you think you can, or think you can't, you are right."

  3. #13
    mortensen's Avatar
    Join Date
    Jul 2009
    Location
    Copenhagen, Denmark
    Posts
    451

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    Quote Originally Posted by Carsten Wolff View Post
    ... What Bob said: Don't forget to mention which focal length that scale is for, not just the max aperture.... SKGrimes and others can also make/send you matching scales.
    Thanks, Carsten. Bob mentioned contacting the Copal factory... Japanese, I see. And SK Grimes is in the States. Do any of you know of a place in the EU that has these scales?
    And, finally, how come it is so important to match both focal length and max aperture? Is it in order to know precisely the selected aperture in regard to exposure?

  4. #14

    Join Date
    Aug 2018
    Posts
    8

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    Quote Originally Posted by mortensen View Post
    Thanks, Carsten. Bob mentioned contacting the Copal factory... Japanese, I see. And SK Grimes is in the States. Do any of you know of a place in the EU that has these scales?
    And, finally, how come it is so important to match both focal length and max aperture? Is it in order to know precisely the selected aperture in regard to exposure?
    Robertwhite got me scales for an Apo-Symmar 10 years ago - I thought I had discovered a secret because the lens could open ca one more stop than f5.6, but the scales was for a wide angle. Nikon shutters are harder to get new scales for, as they are "printed" on a hole ring. DB mounted lenses: I sold my mickey-mouse style lens in shutter on board, since shutter was glued open and one of the arms was removed. A really good job!

    Sent fra min D6503 via Tapatalk

  5. #15
    mortensen's Avatar
    Join Date
    Jul 2009
    Location
    Copenhagen, Denmark
    Posts
    451

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    Quote Originally Posted by Oslolens View Post
    Robertwhite got me scales for an Apo-Symmar 10 years ago - I thought I had discovered a secret because the lens could open ca one more stop than f5.6, but the scales was for a wide angle. Nikon shutters are harder to get new scales for, as they are "printed" on a hole ring. DB mounted lenses: I sold my mickey-mouse style lens in shutter on board, since shutter was glued open and one of the arms was removed. A really good job!

    Sent fra min D6503 via Tapatalk
    Thanks, Oslolens - very informative. I've just contacted Robert White

  6. #16

    Join Date
    Sep 1998
    Location
    GA
    Posts
    11,230

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    Quote Originally Posted by mortensen View Post
    Thanks, Carsten. Bob mentioned contacting the Copal factory... Japanese, I see. And SK Grimes is in the States. Do any of you know of a place in the EU that has these scales?
    And, finally, how come it is so important to match both focal length and max aperture? Is it in order to know precisely the selected aperture in regard to exposure?
    Rodenstock factory, shuttermakers donít make scales, lens manufacturers do.

  7. #17

    Join Date
    Sep 1998
    Location
    GA
    Posts
    11,230

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    Quote Originally Posted by mortensen View Post
    Thanks, Oslolens - very informative. I've just contacted Robert White
    Why would you do that? White adds profit to what they sell, it would be cheaper, and faster, to call Rodenstock directly. That would save the retailerís charges.

  8. #18
    Thalmees's Avatar
    Join Date
    Jun 2006
    Posts
    342

    Re: Can lenses in Sinar DB mount be remounted in copal shutters?

    Quote Originally Posted by Richard Wasserman View Post
    ...
    (paying attention to any shims)
    ...
    Precise and Correct.
    Lens cell spacers(shims) are lens specific not design/model specific. Has specific thickness.
    While it's function could be roughly checked(depends on focal length), say at infinity, close distances or image edges, it's functions could not be assessed except in lab. Short focal length lenses are much difficult or impossible to find the effect of shims on image quality by just simple test on GG(ground glass) or even on film.
    But, we all know that, shims are not arbitrary and not there by chance.
    .
    Quote Originally Posted by mortensen View Post
    ...
    where I can buy aperture scales
    ...
    If I understand you correctly, you can do it your self. Save money and more importantly time.
    Please review: "Recreating a Missing Aperture Scale - A How To"
    http://www.largeformatphotography.in...81#post1455981
    Quote Originally Posted by mortensen View Post
    ...
    I'm looking at an f4.5 lens, and the Copal shutter begins at 5.6
    ...
    Unless you are planning to use your lens at wider than f/5.6, you will only lose 1/2 stop of brightness on your GG.

    The generosity of spirit in this forum is great, its warmly appreciated.
    ------------------------------

Similar Threads

  1. Lenses using Copal 3 and 3S shutters. Chart ?
    By Daniel Grenier in forum Cameras & Camera Accessories
    Replies: 11
    Last Post: 26-Jan-2007, 18:36
  2. Two lenses remounted, which aper. scale is right?
    By Michael_527 in forum Lenses & Lens Accessories
    Replies: 3
    Last Post: 24-Jan-2001, 21:40

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •