I think it's about time to add some Takumar lenses to the collection ;)
The Takumars were produced by the Japanese company Asahi Optical. When the company changed the lens mount from (mainly) M42 to K-bayonet, they also changed the name from Takumar to Pentax. Takumars generally have a good reputation.
The 28mm f/3.5 exists in two models. This lens is a late version of the first model.
Aperture range: f/3.5-f/16
Minimum distance focussing: 40cm
Aperture bladed: 5
I use the following dedicated ARG-file with exiftool: supertak28f35v1.txt
-EXIF:LensModel=Super-Takumar 28mm f/3.5 V1 (M42)
This works with LR4 and NEX-5 RAW-files.