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The Pentax 100mm f/4 SMC Pentax-M Macro is a manual focus macro prime lens built for Pentax’s K-mount SLR system, produced as part of the compact M-series lens lineup. It achieves a maximum magnification of 1:1, allowing subjects to be captured at true life-size reproduction on the film plane, making it well suited to close-up photography of small subjects including insects, flowers, products, and fine detail work. At 100mm the working distance between the front of the lens and the subject at 1:1 magnification is generous, reducing the risk of disturbing light-sensitive subjects or casting shadow during shooting. The SMC designation refers to Pentax’s Super-Multi-Coating applied to the optical elements, intended to reduce flare and ghosting and improve contrast and color transmission. The M-series designation indicates a compact and lightweight construction, and the lens also functions as a capable short telephoto prime for portraiture and general photography beyond its macro applications.
– 100mm focal length with 1:1 maximum macro magnification
– f/4 maximum aperture
– Pentax Super-Multi-Coating (SMC) for flare and ghosting reduction
– Generous working distance at 1:1 magnification
– M-series compact construction
– Pentax K-mount compatibility
– Fully manual focus and aperture control
– Functions as a short telephoto prime beyond macro use
– Compatible with Pentax K-mount film and digital SLR bodies
– Adaptable to mirrorless systems via third-party K-mount adapters
