prime35mmvintage
SMC Pentax-M 120mm f/2.8
Pentax · 1977-1985
Pentax's unique 120mm telephoto. The focal length sits between 85mm and 135mm, offering excellent portrait compression with closer focusing than longer telephotos. Highly regarded by portrait photographers.
Known for
- Portraits
- Headshots
- Events
- Unique focal length
Considerations
- Uncommon focal length
- f/2.8 limits low light
Optical Characteristics
Sharpness (wide)4/5
Sharpness (stopped)5/5
Contrast5/5
Flare Resistance5/5
CA Control4/5
Vignetting Control4/5
Distortion Control5/5
Bokeh: Beautiful 8-blade bokeh
Rendering: Excellent compression
Color: Neutral, accurate
Common Issues
- Focus ring stiffness
- Less common than 85mm/135mm
Buying Guide
Less common than other focal lengths but highly regarded. Check focus smoothness. Worth seeking out.
Specifications
MountPentax K
Focal Length120mm
Max Aperturef/2.8
Min Aperturef/32
Aperture Blades8
Min Focus1.2m
Filter Size49mm
Weight270g
Optical Design
FormulaTelephoto
Elements5
Groups5
CoatingSMC (Pentax)
Pricing
£80 - £150
Typical used price
Mint: ~£200
Premium for unique focal length
Adapts To
Sony EFujifilm XCanon RFMicro Four Thirds
Compatible Cameras
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Last verified: Jan 2026Report an error