I have this lens and use it a lot. It is fully manual screw mount
lens. It is one of the best Macro lense that I own, beside the 200 mm
Macro Pentax. You will also need the screw mount to k mount adapter
There is one on ebay right now....Joe
http://www.ebay.com/itm/Yashica-Yashinon-60mm-f-2-8-Camera-Lens-Pentax-M42-/110856051522?pt=Camera_Lenses&hash=item19cf891b42
This flower in less than an inch in size and I used the above lens to
photograph it..
http://photo.net/photodb/photo?photo_id=16366456
Also used it to photograph most of my Morning Glory's in this set
http://photo.net/photodb/photo?photo_id=16400974
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