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Forum: Pentax Lens Articles 06-24-2013, 08:20 PM  
Sticky: How to use/meter Manual & M42 Lenses on all Pentax DSLRs (K-1, K-3, K-5, K-30, etc)
Posted By TropicalMonkey
Replies: 358
Views: 415,803
I bought a Rikenon EE 135mm/f2.8 M42 lens from eBay. This lens has no Auto-Manual slide switch for Aperture control, rather it is always set in the auto mode. On the mount itself there is a lever in addition to the standard M42 pin (as shown in the picture). How can I use this lens on a Pentax DSLR say K20D? I mean how can I stop down the aperture? One option is to glue the auto-aperture pin to pressed position :-)

Edit:
I got the following link from another site.
http://chris.stingray.free.fr/Tuto/Modif_H44M4/Pinoche_H44M-4.html
Looks like there is no elegant solution for this.
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