Results 1 to 4 of 4

Thread: Question re: convertible lens orientation

  1. #1

    Join Date
    May 2006
    Location
    Oklahoma
    Posts
    254

    Question re: convertible lens orientation

    I thought I had read somewhere here, but can't find the answer.
    When using a triple convertible lens, seems I read that using the rear cell alone, that it should be moved to the front? Or was it when using the front cell alone, it would work better if moved behind the shutter?

    I have not shot this lens yet, but as stated, seems I remember a thread about lens orientations. Does it make a significant diff?

    (Don't guess it makes any diff, but lens is nameless except for "symmetrical convertible" on the lens, mounted currently in a Conley Safety. FL is approx. 12/18/24 judging from bellows draw on a Conley View. Doesn't cover 8x10 wide open, but covers 5x7 nicely, with room for a little wiggle.)

  2. #2

    Join Date
    Sep 2004
    Location
    Gulfport, MS, USA
    Posts
    873

    Re: Question re: convertible lens orientation

    I have always read that the single element group should be used behind the shutter and have always done it this way, though I've never run any tests to see if I could see the difference. I currently use two triple convertibles, a Wollensak and a Turner-Reich.

  3. #3
    All metric sizes to 24x30 Ole Tjugen's Avatar
    Join Date
    Mar 2002
    Location
    Norway
    Posts
    3,377

    Re: Question re: convertible lens orientation

    Quote Originally Posted by Randy H View Post
    II have not shot this lens yet, but as stated, seems I remember a thread about lens orientations. Does it make a significant diff?

    (Don't guess it makes any diff, but lens is nameless except for "symmetrical convertible" on the lens, mounted currently in a Conley Safety. FL is approx. 12/18/24 judging from bellows draw on a Conley View. Doesn't cover 8x10 wide open, but covers 5x7 nicely, with room for a little wiggle.)
    Always on the back, unless you have a very good reason (like insufficient bellows draw) to put it on the front.

    Yes, it does make a difference. Yes, you can very often see the difference by looking at the print, which IMO means it's significant.

    Bellows draw with the single cell behind the shutter is significantly longer than the focal length, which is why it's sometimes necessary to "break the rules". Just as long as you know that it makes a difference...

    I use convertible Symmars in 180, 210, 240 and 300mm, as well as a convertible Turner-Reich, two Zeiss Serie VII Protars, and a handful of casket sets...

  4. #4

    Join Date
    May 2006
    Location
    Oklahoma
    Posts
    254

    Re: Question re: convertible lens orientation

    Thanks for response. I knew I had read somewhere that it would make a diff, but couldn't remember where, or what orientation was recommended.

Similar Threads

  1. Portrait perspective: Quiz and two questions
    By Jerry Fusselman in forum Lenses & Lens Accessories
    Replies: 88
    Last Post: 5-Jun-2006, 17:57
  2. A Lens Testing Question for the Experts
    By Brian Ellis in forum Lenses & Lens Accessories
    Replies: 11
    Last Post: 3-Apr-2006, 20:46
  3. A slightly different lens spacing question
    By Donald Qualls in forum Lenses & Lens Accessories
    Replies: 9
    Last Post: 20-May-2005, 00:07
  4. Mystery 10 1/2" convertible lens
    By Joe Smigiel in forum Lenses & Lens Accessories
    Replies: 2
    Last Post: 12-May-2005, 06:07
  5. Conley 4x5 triple convertible lens
    By Alex mckay in forum Lenses & Lens Accessories
    Replies: 2
    Last Post: 15-Jul-2004, 21:05

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
  •