prime35mmvintage
SMC Pentax-M 100mm f/2.8
Pentax · 1977-1984
Pentax's compact short telephoto. The 100mm focal length provides excellent portrait compression. Remarkably small and light for a telephoto lens. Sharp and contrasty.
Known for
- Portraits
- Candid photography
- Events
- Compact telephoto
Considerations
- f/2.8 limits low light
- 1m minimum focus
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: Smooth telephoto
Rendering: Sharp, punchy
Color: Neutral
Common Issues
- Focus ring wear
Buying Guide
Affordable and compact. Check focus smoothness. Excellent value short telephoto.
Specifications
MountPentax K
Focal Length100mm
Max Aperturef/2.8
Min Aperturef/22
Aperture Blades6
Min Focus1m
Filter Size49mm
Weight224g
Optical Design
FormulaTelephoto
Elements5
Groups5
CoatingSMC (Pentax)
Pricing
£50 - £100
Typical used price
Mint: ~£140
Good value telephoto
Adapts To
Sony EFujifilm XCanon RFMicro Four Thirds
Compatible Cameras
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Last verified: Jan 2026Report an error