Pentax SMC Pentax-M 135mm f/3.5
Introduced: 1977
SMC Pentax-M 135mm f/3.5 is Pentax's medium telephoto prime in the M-series — the entry-level Pentax telephoto, with a slightly slower maximum aperture than competing 135/2.8 lenses but in a notably more compact body. The 135mm focal length serves "tight portrait" and "stage candid" work.
Key features
- 135mm focal length on 35mm full-frame
- f/3.5 maximum aperture — slower than competitors' f/2.8
- 49mm filter thread
- Pentax K bayonet with SMC coating
- 5-element design
- Very compact for a 135mm telephoto
Use case + rendering
- Tight portrait, stage candid, distant landscape detail
- Sharp wide-open at center; very sharp by f/5.6
- The slower aperture is the tradeoff for the compact body
Compatible bodies
Related lenses
- SMC Pentax-M 50mm f/1.4 — standard alternative
- SMC Pentax-M 28mm f/2.8 — wide alternative