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Old Jun 13, 2006, 1:05 AM   #1
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I just got a Super-Takumar 50mm f/1.4 and I mounted it with a Qualide T-mount adapter for pentax K and I'm having focusing problems. I can't get a clear focus further than about 9 inches from the subject. Is there something wrong with what I am doing or is there something needed to be done? Thanks in advance.
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Old Jun 13, 2006, 2:44 AM   #2
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I have a 55mm super-takumar lens that is a screw mount and I use an m42 to K mount adaptor and have no problems.

I would question the T mount, I have never seen one but the standard method is to use the M42 screw mount adaptor.

This is pure guess (I can rely on someone to correct me on this forum when I make a mistake) but the T mount may be acting as an extension tube.

The screw mount adaptor fits flush with the front of the body in the normal distance from lens to sensor. If the T mount is thicker it may move the lens further from the sensor, thus acting as a form of extension tube.

So that is my theory.
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Old Jun 13, 2006, 5:09 AM   #3
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phil is correct.. a lot of the adapters act as a ExT because they move the lens away from the camera body, effectively, leaving you with only close focusing. if you got this off of ebay then you should have asked the seller if the ring would maintain focus at all distances...if they don't answer, or say , i don't know, then forget it..

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Old Jun 13, 2006, 5:37 AM   #4
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The T-mount adaptor is for t-mount lenses, the Takumar is not a t-mount lens. T-mounts move the lens forward several mm, this means the lens now acts like it is extended to a close focus position, probably makes a good macro lens with this set up. A proper m42 to K-mount adaptor fits perfectly flat into the camera body, nothing extends beyond the front flange of the camera's mount. This puts the lens at the correct position to focus to infinity. Get the correct Pentax adaptor and it will work fine.

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