Site Sponsors
Results 1 to 6 of 6

Thread: How do you determine different lens mount focal distances

  1. #1
    Senior Member
    Join Date
    Dec 2008
    Posts
    477
    Post Thanks / Like

    How do you determine different lens mount focal distances

    Specifically, I want to find out the different distances (register distances?) for each of a variety of lens types (nikkor, m4/3, pentax, Pentacon6). And what I really want to ultimately get at is the deltas between some of those.

    Thanks,

    Doug

  2. #2
    Senior Member
    Join Date
    Dec 2008
    Location
    Gothenburg, Sweden
    Posts
    1,309
    Post Thanks / Like

    Re: How do you determine different lens mount focal distances

    You can just google for the distances. "Lens register distance" will get you started.

  3. #3
    Senior Member pellicle's Avatar
    Join Date
    May 2009
    Location
    Southport, Australia
    Posts
    1,429
    Post Thanks / Like

    Re: How do you determine different lens mount focal distances

    Hi

    try this page http://en.wikipedia.org/wiki/Flange_focal_distance

    Systems with short flange-to-film distances include Canon's FD mount (42.00 mm), Canons EF mount and Sigmas SA mount (Both 44.00 mm), Konica's AR (40.70 mm), and Olympus's Four Thirds System (38.67 mm). These can readily take many other brands of lens.

    Systems with larger flange-to-film distances include Nikon's F-mount (46.50 mm), Olympus's OM mount (46.00 mm), and the Pentax K mount/M42 (45.46 mm) universal thread mount. These lenses can be adapted to many camera bodies.

    The Leica M mount has a flange-to-film distance 27.80mm; the Micro Four Thirds System has a flange-to-film distance of only 20 mm. This is enabled by the lack of a reflex mirror.

  4. #4
    Super Duper
    Senior Member
    Vivek's Avatar
    Join Date
    Apr 2008
    Location
    Netherlands
    Posts
    13,594
    Post Thanks / Like
    Images
    21

    Re: How do you determine different lens mount focal distances

    Doug and everyone, this is the latest up to date registry list:

    http://www.graphics.cornell.edu/~wes...-register.html

    Willem Markerink had the original list up at the dawn of the internet era:

    http://www.markerink.org/WJM/HTML/mounts.htm

  5. #5
    Subscriber Member Jonathon Delacour's Avatar
    Join Date
    Dec 2007
    Location
    Sydney, Australia
    Posts
    454
    Post Thanks / Like
    Images
    7

    Re: How do you determine different lens mount focal distances

    Quote Originally Posted by Vivek View Post
    Doug and everyone, this is the latest up to date registry list:

    http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html

    Willem Markerink had the original list up at the dawn of the internet era:

    http://www.markerink.org/WJM/HTML/mounts.htm
    Fantastic, Vivek! Many thanks.

    I was briefly annoyed that they were listed in order of increasing register until I saw the link near the top of the page to the same list in alphabetical order. This page also has a link to another site with some photographs of different mounts.

  6. #6
    Senior Member
    Join Date
    Dec 2008
    Posts
    477
    Post Thanks / Like

    Re: How do you determine different lens mount focal distances

    Excellent!!!

    Thanks,

    Doug

Tags for this Thread

Posting Permissions

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