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After the Rain

Asahi Pentax Super-Takumar 1:1.4/50mm --- NO Filters Used

Aug 28, 2017


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Camera Model PENTAX K-1
Image Date 2017:08:03 19:41:39
Focal Length 50 mm (35mm format equiv.: 50 mm)
Exposure Time 0.0100 sec. (1/100)
ISO 200
Exposure Bias -1.3
Metering Mode Spot
Exposure Program Manual
Exposure Mode Manual exposure
White Balance Auto white balance
Flash Flash did not fire, compulsory flash mode
Colour Space sRGB
Software Adobe Photoshop Lightroom 6.12 (Macintosh)
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  1. Dirk-Jan Smink

    Hi Martin,

    Drops with sun give always rewarding pictures isn't it? Nice picture. I expected a much shorter exposure time with this fast lens (is this one of those glowing versions by the way?).


  2. Martin Middeke

    Hi DJ --- it was really dark, only a few sunrays if I remember correctly. Much of an experiment really, as -1,3 exposure correction is not what I shoot normally.

    I am not sure what you mean by "glowing versions"?

    Cheers, Martin

    1. Dirk-Jan Smink

      Hi Martin,

      One of those radioactive ones, that's what I ment with glowing :-).
      I'm myself a bit reluctant to buy one of those.They yellow as well.


  3. Martin Middeke

    Now I get it. Well, yes, I don't know really if it's one of those radioactive ones or not. -- Perhaps yes, actually, very probably, yes. I always found the (famous) 8-lens version just too expensive. I saw one once, and bought another one. We know about the issue, but it seems to me you would have to glue the lens to your forehead and go to bed with it every day for a year to make radiation effect your health. Eyepieces on cameras, I read, may be dangerous, I never read about an actual DANGER emanating from lenses.
    These are the lenses whose glasses are documented to have used THORIUM OXIDE: SMC Pentax 50mm f/1.4 (original "K line") YouTube
    SMC Takumar 20mm f/4.5 (
    SMC Takumar 35mm f/2.0 (Asahi Optical Co.)
    Super Takumar 35mm f/2.0 (Asahi Optical Co.)
    SMC Takumar 50mm f/1.4 (Asahi Optical Co.) YouTube YouTube
    Super Takumar 50mm f/1.4 (only the latest version with 7 elements)
    SMC Macro Takumar 50mm f/4.0 (
    Super Takumar 55mm f/1.8 (Asahi Optical Co.)
    SMC Takumar 55mm f/1.8 (Asahi Optical Co.) YouTube YouTube (not all)
    Super Takumar 55mm f/2.0 (Asahi Optical Co.) YouTube
    SMC Takumar 55mm f/2.0 (Asahi Optical Co.)
    SMC Takumar 85mm f/1.8 (Asahi Optical Co.)
    Super Takumar 6x7 105mm f2.4 (Asahi Optical Co.)

    1. Martin Middeke

      Honestly, as long as none of us starts EATING their lenses, things should be alright. Radiation only begins to be dangerous INSIDE the body. Usually we don't grind the glass of our lenses to dust and inhale this.

      Also: THORIUM entails ALPHA-radiation: It would never make it outside of the lens. Of course we et a little radiation, but this is far lower than the radiation from natural sources: AIR (Radon), BANANAS (Kalium 40). Wrist watches use Tritium for the phosphorescence of their digits, smoke detectors contain Americium-241.

      Actually, eating a banana is more dangerous that alpha or gamma radiation from photographic lenses. In case you worry: Gamma-radiation (of THORIUM) has a half-life of 14 billion (14 Milliarden, in German; years).

      Anyone who wants me to dispose of their radioactive Takumars may sure send them to me. ;-)

    2. Dirk-Jan Smink

      Hi Martin,

      I have been through all the articles on the web as well. It was more out of curiousity from my side (maybe too curious). You might be right about the danger of these lenses.
      I just wanted to prevent that you might be picked up by a bunch of aliens when you walk in the fields with a backpack full of glowing Takumars.

      Take care and enjoy your oldies.


      P.S. Here's another link for your 1/1:4 50mm, as far as I know the 1/1.9 85mm has no Thorium.

  4. Janny

    Hi Martin,
    It's spectacular what you and DJ en Ernst can do with the Takumar. Super.
    Greatings Krijtje

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