SMC PENTAX "K" 55mm F/1.8
Front cap generic, rear, Pentax
Fits all modern Pentax SLRs and DSLRs,
plus many other makes with appropriate adapter.
Please refer to photos
I've tried to cover everything
 Description from Pentax Forums
Overall score of 9.39 is VERY commendable
Worth following the link at end of description to read user reviews
(copy and paste in browser)

SMC Pentax 55mm F1.8

Sharpness 
 9.3
Aberrations 
 8.7
Bokeh 
 8.9
Handling 
 9.4
Value 
 9.6
ReviewsViewsDate of last review
63165,680Thu November 17, 2016
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Recommended ByAverage PriceAverage User Rating
98% of reviewers$54.599.39
SMC Pentax 55mm F1.8

SMC Pentax 55mm F1.8
supersize
SMC Pentax 55mm F1.8
supersize

Description:
The SMC Pentax 55mm F1.8 is the faster version of the 55mm Pentax bayonet lens, unique to the K series.



SMC Pentax 55mm F1.8
Image Format
Full-frame / 35mm film
Lens Mount
Pentax K
Aperture Ring
Yes (no A setting)
Diaphragm
Automatic, 6 blades
Optics
6 elements, 5 groups
Mount Variant
K
Max. Aperture
F1.8
Min. Aperture
F22
Focusing
Manual
Min. Focus
45 cm 
Max. Magnification
0.17x 
Filter Size
52 mm 
Internal Focus
No
Field of View (Diag. / Horiz.)

APS-C: 29 ° / 25 °
Full frame: 43 ° / 36 ° 
Hood
PH-R52
Case
Dedicated hard case
Lens Cap
Plastic clip-on
Coating
SMC
Weather Sealing
No
Other Features
Diam x Length
63 x 39 mm
Weight
221 g
Production Years
1975 to 1977
Engraved Name
SMC PENTAX 1:1.8/55
Product Code
20747


Read more at:  http://www.pentaxforums.com/lensreviews/SMC-Pentax-K-55mm-F1.8-Lens.html#ixzz4Vk3gou8N
 

Condition:

In lovely condition, fully functional, 
with only slight signs of use 
 Focus smooth, aperture good and "snappy", 
Glass clean, free from scratches, haze and fungus. 
Minimal small dust inside, nothing above normal. 
With original Asahi Pentax rear cap (Generic front cap).
Any questions, please ask
If you have been, thanks for looking