This lens has Pentax Super Multi-Coating (SMC)
Made by Asahi opt. co. in Japan

Specs:

Focal length: 50mm	Weight: 185g
Optical design: 6 elements in 5 groups	Mount: Pentax K (PK)
Aperture: f/1.7 to f/22 6 bladed aperure	Covers: Standard 35mm film size (24×36 mm negative)
Closest Focus: 0.45m (1.5ft)	Filter Size: 49mm (non-rotating)

Image quality


Build quality

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


Conclusion

A lens which is quite small, lightweight but with still great build quality.
Close focus, good image quality and usually not very expensive to buy.
Not much more one can ask and yes this makes this lens a very nice one.

Image quality wide open has a good center sharpness but a little curved focal plane which gives some corner softness at infinity.
It's not perfect but I find it very nice wide open.
Stop it down a little and it is very nice and sharp.

Also renders very nice with good contrast and bokeh.


Thumbs up:
Image quality
Build quality
Bokeh
Value for your money
Quite small & lightweight plus has still a good close focus

Thumbs down:
A bit curved focal plane

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Technical Info

Analogue
Camera: Chinon CG-5
Scanner: Plustek OpticFilm 7600i
Film: AGFA CINEREX (X-ray film)
Developer: Kodak Xtol

Digital
Canon 500D with lens mount adapter