Made between 1966 to 1978.

Specs:

Focal length: 135mm	Weight: 500g (520 with it's metal lens hood)
Optical design: 5 elements in 4 groups	Mount: M42 or Exakta
Aperture: f/2.8 to f/32 15 bladed aperure (Preset)	Covers: Standard 35mm film size (24×36 mm negative)
Closest Focus: 1.5m (5ft)	Filter Size: 55mm (non-rotating) Lens hood can use 58mm filters

Image quality


Build quality

It's all metal and are very solid and well built.
The feel of this is also very good.


Conclusion

This is one of my favorite 135mm lenses and it's a really good one.
Image quality is great and it has one of the best looking bokeh.
The 15 bladed preset aperture keeps the bokeh round and smooth stopped down.
And it gives nice and contrasty images.

Sharpness wide open is good but not perfect.
It has a little curved focal plane so there is some corner softness at infinity.
But stop it down a little and you can get some really sharp images and this starts to show after f/4 - f/5.6.

However stopping it down all the way to f/32 is not always that great.
Loss in sharpness is expected but my copy also gives a little light spot in the middle.
It's not always that noticeable and I more or less never use this aperture but it could be a problem for those that do.

A very nice lens as long as you don't mind the preset aperture which can be a little slow to work with.


Thumbs up:
Image quality
Build quality
Great Bokeh
15 bladed aperure

Thumbs down:
Light spot in the midde at f/32

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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