[UV] the pre-predecessor of the UV Nikkor

Discussion in 'Night, InfraRed, and UltraViolet Photography' started by kds315, Jun 22, 2007.

  1. kds315

    kds315

    486
    May 30, 2006
    Dr Klaus Schmitt
    Group,

    this is what has been used many years ago before fully corrected lenses for UV have been designed using CaF2, like the UV Nikkor 105mm or the Coastal Optics Micro Apo 105mm.

    [​IMG]

    [Excursion: one might wonder about the aperture range, this is the so called "old series" which was used before WWII:
    1,1 – 1,6 – 2,8 – 3,2 – 4,5 – 6,3 – 9 – 12,5 – 18 – 25 – ... as compared to the modern one, 1/2 steps
    1,2 – 1,8 – 2,4 – 3,5 – 4,8 – 6,5 – 9,5 – 13 – 19 – 27 - …]

    Some first results using that lens (crude setup with fix focus at 250mm, need focusing mount), shot outside. All shots ISO400 (100% crop to 1024pix). The UV filter which came with it is a Carl Zeiss Jena U.V. Glass x42R which has a nice UV transmission 300...410nm, peak 87% at 370nm, but also quite some IR transmission 700...>900nm, peak 30% at 750nm. UV (42R+BG40) exposure compared to visual (at f1.8 ): -9EV

    Visual shot at f1.8:
    80859533.

    UV shot at f1.8 (w. Zeiss x42R U.V. Filter Glas + BG40 to block IR), focus +40mm (closer):
    80859532.

    Visual shot at f4.5:
    80859529.

    UV shot at f4.5 (w. Zeiss x42R U.V. Filter Glas + BG40 to block IR), focus +40mm (closer):
    80859530.

    Visual shot at fully closed aperture:
    80860331.

    UV shot at fully closed aperture (w. Zeiss x42R U.V. Filter Glas + BG40 to block IR), focus +40mm (closer):
    80860330.

    Played around with UV macro at different apertures, SB-140 + SW-5UV + BG40. UV focus has to be found experimentally, closer of course, wide open DOF is fractions of a milimeter. Sharpness is of course not what could be expected from an UV Nikkor, but quite neat, esp. open with very short exposure times. So here comes the better ones!

    f7.7 (f8 in new terms)
    original.

    f2.4 (f2.8 in new terms)
    original.

    So still a way to go like mounting that setup on a helicoid and seing if infinty focus works (which it should)...
     
  2. DrewC

    DrewC

    Jan 30, 2007
    Denver, CO
    that stuff is amazing, way to go
     
  3. kds315

    kds315

    486
    May 30, 2006
    Dr Klaus Schmitt
    Thanks, exciting indeed. Will keep you posted about new findings!
     
  4. mycom

    mycom

    67
    Apr 24, 2006
    Amazing !
    How did you mount the lens to the camera ??
     
  5. kds315

    kds315

    486
    May 30, 2006
    Dr Klaus Schmitt
    Thanks,

    mounted using a special M39 to Nikon adaptor.
     
  6. FishSauce

    FishSauce

    Aug 10, 2005
    Chicago, IL
    Amazing pictures, I like the close up. UV is the area that I haven't got into yet.
     
  7. kds315

    kds315

    486
    May 30, 2006
    Dr Klaus Schmitt
    Hi Ben,

    thanks, and yes it is an amazing field which excites me a lot. Quite a bit of surprises waiting for the avid searcher....
     
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