Specs:

Focal length: 135mm	Weight: 275g
Optical design: 5 elements in 5 groups	Mount: Pentax K (PK)
Aperture: f/3.5 to f/32 8 bladed aperure	Covers: Standard 35mm film size (24×36 mm negative)
Closest Focus: 1.5m (5ft)

Image quality


Build quality

Very well made and are solid as a rock.
The feel is also very good.


Conclusion

Quite the small and lightweight lens for a 135mm which is always a nice plus.
Still well built and quite good performance.

Image quality is nice and sharp even wide open.
Do have some color fringing which is gone by f/5.6.
I find the bokeh quite nice at most cases but also a bit off at others.
Also handles flare and backlight very well.

I find it to be a good little travel tele when you don't want to carry more than needed.


Thumbs up:
Image quality
Build quality
Lightweight and quiet small
8 bladed aperure


Thumbs down:

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Technical Info
Scanner: Plustek OpticFilm 7600i
Film: Kodak Tmax 100
Developer: Kodak Xtol

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