prime35mmvintage
SMC Pentax-A 28mm f/2.8
Pentax · 1984-1988
Pentax's A-series wide-angle with program mode compatibility. Optically identical to the M version with added automatic exposure capability. Excellent all-round wide-angle.
Known for
- Travel photography
- Street photography
- Program mode use
- Landscapes
Considerations
- 5 aperture blades
- 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 Control4/5
Bokeh: Pleasant for wide angle
Rendering: Sharp, contrasty
Color: Neutral
Common Issues
- Focus ring wear
Buying Guide
Common and affordable. Good A-series wide-angle. Check focus smoothness.
Specifications
MountPentax K
Focal Length28mm
Max Aperturef/2.8
Min Aperturef/22
Aperture Blades5
Min Focus0.3m
Filter Size52mm
Weight170g
Optical Design
FormulaRetrofocus
Elements7
Groups7
CoatingSMC (Pentax)
Pricing
£45 - £90
Typical used price
Mint: ~£120
A-series wide-angle pricing
Adapts To
Sony EFujifilm XCanon RFMicro Four Thirds
Compatible Cameras
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Last verified: Jan 2026Report an error