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02-10-2012, 01:18 PM   #1
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How do AUTO Takumar lenses work on a DSLR?

I have three AUTO Takumar lenses and some Takumar preset lenses too. They have the same formula, either the 105/2.8 and the 135/3.5. The AUTO is supposed to be a step forward the preset, and a precursor of the full AUTO diaphram lenses. The AUTO come with a COKING(?) button that when pushed opens wide the diaphram. The way I have being doing it is: I set the aperture manually with the aperture ring, then push the coking button, and shoot. I get nice photos, in fact great. However, two of my AUTO lenses have broken(?) they remain open. Did I do something wrong, or it is just the failure of a spring or so. In any case, is it something that Eric can fix? Also, one of the 135/3.5 AUTO TAK is so AUTO that I have to keep the pin pushed down. I am thinking crazy glue to keep it down. What do you think, your advice is appreciated.
Thanks, Pepe.

02-10-2012, 01:28 PM   #2
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You would use them just like normal takumars on a DSLR. I believe they did away with the two aperture rings on auto takumars and instead added a auto/manual diaphragm switch, obviously you will have to keep it on manual on a DSLR since it doesn't have the controls needed to automatically stop the lens down.

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02-10-2012, 02:18 PM - 1 Like   #3
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There were two versions of "Auto Takumar" lenses: one that was fully auto, like the Super Takumar (I have one on an early SV) that has an auto/manual switch, and the Semi-automatic "Auto Takumar" that has a cocking lever at the base of the lens to re-open the diaphragm. I have one of these on an H1. On this type, the lever opens the diaphragm, and the Screw-Mount body closes the diaphragm by pushing the actuating pin like on the Super Takumar - expect the diaphragm stays closed after taking the picture. These semi-auto lenses have no auto/manual switch, so there is no external way to stop them down after cocking the diaphragm open.
Since the Pentax dSLRs don't have the right mechanism to push in the lens pin, you need to use an AutoTakumar without cocking the diaphragm open, since it would stay open. Just leave the lever uncocked and stop the lens down manually when ready to take the picture - or learn to focus with the lens stopped down.

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