Specs:

Focal length: 135mm	Weight: 400g
Optical design: ??	Mount: M42
Aperture: f/2.8 to f/22 8 bladed aperure Auto or Manual	Covers: Standard 35mm film size (24×36 mm negative)
Closest Focus: 1.5m (5ft)	Filter Size: 55mm (non-rotating)

Built-in extendeable hood


Image quality


Build quality

All metal and very well put together.
The feel of the lens i s also very nice.

Conclusion

Mamiya lenses are usually great and this is definitely no exception.
This is of course not perfect but still very nice.

Image quality wide open is nice and sharp but has a little curved focal plane which gives a some soft corners at infinity.
Renders quite well and bokeh can give a little swirl effect which I find nice.
Flares are not the best looking but backlight are usually not a problem.


Thumbs up:
Image quality
Renders, Bokeh
Build quality and feel

Thumbs down:
Flare

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Technical Info

Analogue
Camera: Chinon CEII Memotron
Scanner: Plustek OpticFilm 7600i
Film: AGFA CINEREX (X-ray film)
Developer: Kodak Xtol

Digital
Canon 500D with lens mount adapter
Auto White Balance and ISO 100