Pentax's classic pancake — the M 40mm f/2.8 that defined compact K-mount.
The Pentax SMC Pentax-M 40mm f/2.8 is the original version of Pentax's legendary pancake lens — one of the thinnest SLR lenses ever produced. The M-series designation indicates the compact manual-focus era. At 40mm, it provides a natural standard perspective. The pancake form creates one of the most compact K-mount SLR setups possible.
Good sharpness from the compact pancake design. The 40mm provides a natural perspective between 35mm and 50mm. The SMC coating ensures good contrast. The ultra-thin design barely protrudes from the camera body. Build quality solid with smooth focus. The M-series 40mm f/2.8 launched the pancake concept that Pentax has continued through multiple versions.
Pentax K mount — compatible with all Pentax bodies. Filter thread 49mm. Weight approximately 110 grams — negligible. Build quality compact metal with SMC coating. Manual focus. The M-series version predates the A-series auto-aperture variant. Benefits from body SR on digital Pentax. The thinnest Pentax M-series lens.
Available at moderate prices — pancake lenses hold value. Check smooth focus. The original Pentax pancake — one of the most iconic K-mount designs. The A-series version adds auto-aperture convenience for digital. The M-series version is the classic original. Creates the most compact K-mount SLR setup possible.