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10-03-2010, 12:53 PM   #16
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QuoteOriginally posted by FishrOfGrizz Quote
So cutting thru all of the technical stuff, how will an Auto-Tak work on a K10D? Other than it being a manual lens, I won't have to do anything with the contacts will I?
you will have no problem with contacts (im assuming you mean the contacts on the bodies lens mount?), and an Auto-Takumar (assuming the cocking lever is fully functional) will operate the same as any later takumar. you just don’t use the cocking lever at all, the same way you would keep a later takumar on ‘manual’ so the aperture will stop down allowing the use of Av mode. the cocking lever is really only of use on the bodies the lenses were meant to be used on.

10-04-2010, 11:07 AM   #17
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Auto-Taks and their ilk (other M42 screwmount lenses with aperture pins) were designed for M42 film cameras with the stop-down feature. Those with M/A switches also worked on more primitive M42 bodies. Using such lenses on a modern dSLR like your K10D or my K20D involves either leaving the M/A switch at M; or if the lens lacks an M/A switch, by jamming the pin down to keep the aperture at your desired f-stop. Put the dSLR into either M(anual) or Av mode.

M42 lenses *may* interact with the dSLR mount contacts. Many have wide enough bodies that you can stick a bit of metal tape on the lens base, which then (safely) shorts-out the contacts, allowing these lenses to be used with Catch-In-Focus (CIF) aka Trap-Focus. Alas, many Takumar primes (and some German and Russian lenses) have narrow bodies that don't reach the pins. Sometimes a bit of metal foil can be inserted, but often not. If you *need* CIF for a narrow lens, you can use a (safe) flanged non-infinity-focus adapter, but only for closeups and macros and certain long telephotos.
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