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08-13-2012, 05:34 AM   #1
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tamron 400/6.3 m42

In a LBA-spree I managed to get this in very good condition.
Apparently in M42 mount with a Tamron K-adapter.

It is a manual Tamron-Popular 400mm f6.3 preset lens. How does the preset work? I managed to get some pics wide open, focusing was difficult but when focusing to infinity it was impressive.

Is this a decent lens? I did not find it anywhere on the web. Not even in the PhotoPentax web site.


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08-13-2012, 06:01 AM   #2
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08-13-2012, 06:10 AM   #3

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Decent? Maybe. Probably no better than "decent" though -- some of those old 400/6.3s are downright soft. The preset works by setting the frontmost ring (towards the front of the lens) to the aperture you want to use (start with both set wide open). So if you want to use f11 for your shot, you'd set that ring to f11 and leave the other at 6.3. Now you can focus through the viewfinder at 6.3 to get the most light, then when ready to shoot move the second ring until it stops -- it should move very easily and stop at f11. The lens doesn't actually stop down until you move the second ring. The idea is you don't have take your eye from the camera after focusing.
08-13-2012, 09:36 AM   #4
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This should work perfectly on Pentax dSLR cameras in aperture priority. vonBaloney's explanation of how to use the presets is spot on. Figure the f/stop you want to use, set the detented ring, flick the other one down after focusing. I did that from 1961 until about 1976 when I finally went from AP to K mount. Practice a bit, and it becomes second nature.

08-13-2012, 10:14 AM   #5
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No idea about the lens, but don't go around thinking it's M42 mount, you might try to mount it like that and damage something. It's very much more likely to be T (T2) mount.
08-13-2012, 12:07 PM   #6
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Drougge is right, it is a T2-mount with adapter. No harm was done.

I did not have high hopes with this one, came in a package with the M85 and a few other goodies.


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