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Forum: Pentax SLR Lens Discussion 04-20-2018, 12:46 PM  
Adapting Altix lenses to Pentax K using an M42 adapter
Posted By cyberjunkie
Replies: 6
Views: 1,300
I converted (or I'm going to) all the Altix lenses but the rare Lidyth.
I encourage those interested to go through the hassle to use a M39 to M42 adapter, and only after screw on top of it a Chinese M42 to PK adapter without screw/spring.
Because of the way the PK adapter is made, it is better to fill with glue the inner space between the adapter and the lens, so to be absolutely sure there is no chance of light leaks. I use black hot glue because it would be easy to remove, just in case...
I found that filing a little more than needed allows to turn the inner ring to have the focus/diaphragm reference on top. If it's a little too loose, I use a tiny bit of aluminum foil to make it tight, then I glue.
With the inner ring all the way down, the register is perfect, as by magic :) With the similar Exakta bayonet some correction is needed.
Filing only one side isn't blasphemy, but of course the lens would be slightly decentered. No effect on performance, as far as the lens is perfectly parallel to the focal plane. I still prefer to file all three sides, though :)
The Altix mount attracted my attention because of the Trioplan 50mm, but now I think that the most valuable one is the 35mm. The minuscule Tessar 50mm and the tele 90mm aren't bad either. The Tessar is a fine little lens, and all the Meyer's have a beautiful bubbly bokeh.
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