Pentax-M 50mm f/1.7 – Compact Manual Prime Lens for Pentax K Mount
The Pentax-M 50mm f/1.7 is a classic manual focus prime lens from the late 1970s and early 1980s, built for Pentax K-mount film SLRs. With its fast f/1.7 aperture and compact metal design, it delivers sharp, contrast-rich images with beautiful background separation. This lens is highly regarded for its excellent optical performance and smooth handling—ideal for both film and adapted digital use.

Key Features

• Brand: Pentax (Asahi Optical Co., Japan)

• Lens Model: SMC Pentax-M 50mm f/1.7

• Serial Number: 4011245

• Lens Mount: Pentax K mount (manual focus)

• Focal Length: 50mm

• Maximum Aperture: f/1.7

• Aperture Range: f/1.7 to f/22, 6-blade diaphragm

• Minimum Focus Distance: 0.45 m

• Filter Thread: 49mm

• Build: Compact, all-metal construction

• Use Case: Perfect for portraits, street, low-light, and adapted mirrorless photography

Condition

Used – Good condition.
Glass is clean with no haze or fungus. Aperture blades are dry and responsive. Focus ring turns smoothly, and aperture ring clicks firmly into place. Minor cosmetic wear on the barrel consistent with normal use.

What’s Included

• Pentax-M 50mm f/1.7 lens (Serial: 4011245)

• Front and rear lens caps