Pentax 135mm f3.5 SMC Pentax-M Lens

NOTE: Some artifacts in between lens elements that will likely show in image.

The Pentax 135mm f/3.5 SMC Pentax-M is a compact manual focus telephoto prime lens built for Pentax K-mount 35mm SLR cameras, offering a classic telephoto focal length in the notably small, lightweight body that defined Pentax’s M-series lens lineup. Designed to complement Pentax’s compact M-series camera bodies, this lens prioritized portability without sacrificing the optical quality Pentax’s SMC coating was known for.

The 135mm focal length provides a solid telephoto reach well-suited to portraits, candid photography, and general subject isolation, allowing photographers to fill the frame with distant subjects while maintaining a comfortable working distance. Its f/3.5 maximum aperture, while more modest than faster telephoto options, kept the lens compact and lightweight, aligning with Pentax’s M-series design philosophy of building genuinely portable optics that wouldn’t unbalance smaller camera bodies.

Optically, the lens benefits from Pentax’s SMC (Super Multi Coating) technology, applied to reduce internal reflections, flare, and ghosting while improving contrast and color rendition, a meaningful advantage over lenses using older, single-layer coatings. This coating technology helped the M-series lenses deliver noticeably clean, contrasty images that held up well even in challenging lighting conditions, contributing to their lasting reputation among film photography enthusiasts.

Built with the all-metal construction typical of Pentax’s manual focus era, the lens features a smoothly damped focus ring and a manual aperture ring with click-stops for precise, tactile exposure control. Its Pentax K mount allows it to attach directly to Pentax’s manual focus and many autofocus K-mount SLR bodies, and with the appropriate adapter, it can also be adapted to numerous mirrorless camera systems, giving it continued relevance for photographers who enjoy shooting with compact, high-quality vintage glass.

Specs:
– Focal length: 135mm
– Maximum aperture: f/3.5
– Lens mount: Pentax K mount
– Coating: SMC (Super Multi Coating)
– Focus type: Manual focus
– Aperture control: Manual aperture ring with click-stops
– Construction: All-metal barrel and mount