Results 1 to 5 of 5

Thread: Diaphragm placement

  1. #1

    Join Date
    Sep 2019
    Location
    Columbus OH
    Posts
    47

    Diaphragm placement

    Typically the diaphragm for the aperture is between the front and rear elements. Is there a reason it can’t be in front of the lens or behind?

    Thanks

  2. #2

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    8,470

    Re: Diaphragm placement

    It depends on the lens' design. Some lenses have the diaphragm in front of the glass, for example the meniscus lenses used in low-end Kodak folders. Some have the diaphragm behind the glasses, for example the 200/4 MicroNikkor AIS.

  3. #3
    Jim Jones's Avatar
    Join Date
    Aug 2006
    Location
    Chillicothe Missouri USA
    Posts
    3,065

    Re: Diaphragm placement

    Changing the position of many lenses from that specified by the optical designers in some cases can cause much deterioration of the image. As for the old Kodaks with a simple meniscus lens, the concave lens surface faces the diaphragm whether the lens is either in front of or behind the diaphragm. Having the diaphragm in front of the lens lengthened the camera, but improved image quality.

  4. #4

    Join Date
    Nov 2017
    Posts
    381

    Re: Diaphragm placement

    look through a lens from different angles and see what happens to the aperture.

  5. #5

    Join Date
    Feb 2019
    Location
    Vilnius, Lithuania
    Posts
    211

    Re: Diaphragm placement

    Diaphragm put in that manner will induce vignetting, at least.

Similar Threads

  1. Fresnel placement
    By David Grandy in forum Cameras & Camera Accessories
    Replies: 8
    Last Post: 1-Mar-2020, 14:44
  2. Aperture placement
    By swmcl in forum Lenses & Lens Accessories
    Replies: 27
    Last Post: 13-Mar-2010, 18:27
  3. ND Grad Placement Tip
    By robertmgray in forum Lenses & Lens Accessories
    Replies: 6
    Last Post: 3-Jan-2010, 10:41
  4. Placement of shutter
    By gilles langlois in forum Lenses & Lens Accessories
    Replies: 2
    Last Post: 20-May-2001, 03:27
  5. diaphragm position
    By Franco Rallo in forum Lenses & Lens Accessories
    Replies: 5
    Last Post: 5-Feb-1999, 21:06

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
  •