Production
1978 – 1984
Country
Japan
Optical
5 elements in 4 groups
Updated
Feb 15, 2026
M42
Production
1978 – 1984
Country
Japan
Optical
5 elements in 4 groups
Updated
Feb 15, 2026
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.
nice
good
Sharp even wide open
Some chromatic aberration, especially at wider apertures
High
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.
https://www.vintagelensesforvideo.com/pentax-smc-200mm-f2-5-lens-test/
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.