Unmarked aperture detent on Zeiss Planar?

Discussion in 'Adapted Lenses' started by Charles2, Jun 15, 2010.

  1. Charles2

    Charles2 Mu-43 Regular

    25
    May 17, 2010
    Bought a Zeiss Planar T* f/1.7 50mm, no documentation. The aperture ring has an unmarked detent between the marked ones at 1.7 and 2.8.

    f/1.9? Or a defect?

    Common on Zeiss lenses, on legacy lenses in general?

    If you can suffer to look at another flower shot, here is an example at that detent. It was taken through a Lexan (polycarbonate) window.
    https://farm5.static.flickr.com/4011/4703348707_4e68be8978_b.jpg
     
  2. BillN

    BillN Mu-43 All-Pro Charter Member

    Jan 19, 2010
    SW France
    do you mean it has a "unmarked" stop - (half a stop?) - between the marked stops

    my CV Ultron has one between each marked stop right the way up the scale - as do some of my Canon FD lenses and I think my Leica RF lenses have also
     
  3. Charles2

    Charles2 Mu-43 Regular

    25
    May 17, 2010
    Just the one unmarked detent

    I have a Marexar f/2.8 28mm that has unmarked half stops through the whole aperture range, like your lenses. The Zeiss has only one unmarked stop between the 1.7 and 2.8 marks.
     
  4. jesse

    jesse Mu-43 Regular Charter Member

    104
    Dec 16, 2009
    Hong Kong
    It should be f2.0