M 40/2.8

M 40/2.8

General Description

The first thing that one notices about this lens is how flat, small and light it is — no wonder that it is known as "the pancake." It is a result of the late 1970’s push towards compactness, and is designed to be the perfect companion to the M-series Pentax bodies. Due to their small size, the focusing and aperture rings are rather difficult to use.

Contrary to the popular belief, this lens is not very rare. When the lens was available new it was priced at about US $75.

Product Information
Exact Name smc PENTAX-M 1:2.8 40mm
Color black
Year of Introduction 1976
Catalog Number 20167
Sold with Hood
Sold with Case hard case: HA-90B

Technical Specifications

Optical Formula 5 elements in 4 groups
Aperture Range f/2.8 ~ f/22
Number of Aperture Blades 5
Minimum Focusing Distance 0.6 m
Maximum Magnification 0.08 X
Filter Diameter 49 mm
Maximum Diameter 63 mm
Length 18 mm
Weight 110 g
Cap plastic clip-on cap, 49 mm
Fitting Hood(s) screw-on hood: RH-R49
Fitting Case(s) hard case: HA-90B