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Pentax SMC Pentax-M 40mm f/2.8 Pancake

M42

No photo available for this lens

Production

1978 – 1984

Country

Japan

Optical

5 elements in 4 groups

Updated

Feb 15, 2026

Overview

The SMC Pentax-M 40mm f/2.8 Pancake is impossibly thin — one of the thinnest SLR lenses ever made. Designed for the compact Pentax ME/MX cameras, it turns any camera into a near-rangefinder experience. Sharp, tiny, and with a unique 40mm perspective.

Verdict: The ultimate compact lens. If you want a tiny, sharp lens for everyday carry, the 40mm pancake is magical.

Optical Character

Bokeh

nice

Color

good

Sharpness wide open

Sharp even wide open

Flare resistance

Some chromatic aberration, especially at wider apertures

Contrast

High

Community Insights

Summary: The Pentax SMC 200mm f/2.5 lens is a unique and impressive vintage lens, praised for its fast aperture, build quality, and image quality. However, its high price compared to similar lenses like the Tokina 80-200mm f/2.8 makes it a tough sell for some users. Sentiment: Mixed Top Praised: - Fast f/2.5 aperture - Excellent build quality and handling - Produces sharp, high-contrast images Top Complaints: - Relatively high price compared to similar lenses - Significant chromatic aberration, especially wide open - Narrower zoom range compared to a zoom lens Use Cases: - Portrait and wildlife photography - Video work due to the manual aperture and focus controls - Landscape and cityscape photography Disagreements: - Whether the f/2.5 aperture is worth the premium over an f/2.8 lens Confidence: 0.8 The sources provide a fairly consistent assessment of the lens, with some divergence on the value proposition compared to alternatives.

What people love
  • Incredibly compact
  • Sharp for its size
  • 40mm is great focal length
  • Makes camera pocketable
  • Unique character
What people dislike
  • Only f/2.8
  • Pentax K mount (not M42)
  • Focus ring is tiny

Sources (2)

vintagelensesforvideo-

https://www.vintagelensesforvideo.com/pentax-smc-200mm-f2-5-lens-test/

Lens Heritage 2nd JSONsecondary

The SMC Pentax-M 40mm f/2.8 Pancake is impossibly thin — one of the thinnest SLR lenses ever made. Designed for the compact Pentax ME/MX cameras, it turns any camera into a near-rangefinder experience. Sharp, tiny, and with a unique 40mm perspective.