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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 Namesmc PENTAX-M 1:2.8 40mm
Years of Production1976 ~ 1984
Availabilityused, several times a month
Catalog Number20167
Sold with Hood
Sold with Casehard case: HA-90B

Technical Specifications

Optical Formula5 elements in 4 groups
Aperture Rangef/2.8 ~ f/22
Number of Aperture Blades5
Minimum Focusing Distance0.6 m
Maximum Magnification0.08 X
Filter Diameter49 mm
Maximum Diameter63 mm
Length18 mm
Weight110 g
Capplastic clip-on cap, 49 mm
Fitting Hood(s)screw-on hood: RH-R49
Fitting Case(s)hard case: HA-90B