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  1. #1

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    Pentax Screw Mount Lenses

    Were there any great Pentax screw mount lenses that had the auto/manual diaphragm switch?

  2. #2
    josephaustin's Avatar
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    Im not sure what you mean, the switch was usually on the camera for the Pentax series, and the lens had a small button an the inside of the back flange.

  3. #3
    Trond's Avatar
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    Pentax had a Auto/Manual switch on all Super-Takumar lenses or newer, at least as far as I know. Earlier lenses, such as Takumar and Auto-Takumar don't have it.

    In other words, there are a great deal of great Pentax screw mount lenses with the Auto/Manual switch.

    Trond
    Last edited by tbaashus; 12-18-2005 at 02:01 PM. Click to view previous post history.

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    Donald Qualls's Avatar
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    For certain, my Super Takumar 50 mm f/1.4 has the auto-manual ring; turning it to manual stops the lens down the same as turning on the meter or pressing the shutter release. This would also allow using it as a "preset" lens on a non-auto M42 camera, as long as the operating pin doesn't interfere with anything in the camera.
    Photography has always fascinated me -- as a child, simply for the magic of capturing an image onto glossy paper with a little box, but as an adult because of the unique juxtaposition of science and art -- the physics of optics, the mechanics of the camera, the chemistry of film and developer, alongside the art in seeing, composing, exposing, processing and printing.

  5. #5
    Marco Gilardetti's Avatar
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    Quote Originally Posted by waynecrider
    Were there any great Pentax screw mount lenses that had the auto/manual diaphragm switch?
    The answer is:

    28mm f:3,5 yes, great lens
    50mm f:1.4 yes, outstanding lens
    85mm f:1.9 yes, superb lens
    I know a chap who does excellent portraits. The chap is a camera.
    (Tristan Tzara, 1922)

  6. #6
    titrisol's Avatar
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    The ones I have all of them have the "switch"
    Besides the ones Marco mentiond:
    200/4
    55/1.8
    50/1.4
    17/4
    Mama took my APX away.....

  7. #7
    Seele's Avatar
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    Wayne,

    Automatic diaphragm M42 lenses without the A/M switch are actually quite a minority, I am wondering why you are hoping to find those specifically with this feature though...

    If there is a need for you to stop down the diaphragm by hand, perhaps not by using the camera's stop-down actuator (or even if you use something like a very early Contax/Pentacon or Praktica without this feature), then also consider those lenses made without automatic diaphragm altogether. I use a number of them regularly such as the Hugo Meyer Orestor 100/2.8 (first version), Pierre Angenieux Retrofocus R1 35/2.5 (first version as well), among others; they are very satisfactory too.

  8. #8
    josephaustin's Avatar
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    For certain, my Super Takumar 50 mm f/1.4 has the auto-manual ring; turning it to manual stops the lens down the same as turning on the meter or pressing the shutter release. This would also allow using it as a "preset" lens on a non-auto M42 camera, as long as the operating pin doesn't interfere with anything in the camera.
    Now I understand, sorry I was confused.

  9. #9

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    Quote Originally Posted by Seele
    Wayne,

    Automatic diaphragm M42 lenses without the A/M switch are actually quite a minority, I am wondering why you are hoping to find those specifically with this feature though...
    For use with a P adapter on a older Canon body. You have to stop the lens down manually. The reason I was thinking of using the Super Tak's was the high regard for their lenses, and quite possibly cheaper prices. Well I did a little research thru dealers and the cheaper prices is now just an imaginary dream, but I'll probably look at Ebay and see how their going. I could use a long lens over 200mm.

  10. #10

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    Good luck in finding a Super Tak or SMC Tak over 200mm at a reasonable price.

    Spotmatic users don't realize how obsolete those screwmount lenses are (you know, the one's with the great glass, tough mechanical build, and smooth focusing).

    I still have my Spotmatic and wish I had never sold my 28mm Super-Tak.

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