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A 50/2.8 Macro

General Description

This lens employs floating elements, a construction normally used for better optical performance at small focus distances. The floating group is the one directly behind the front lens.

Product Information
Exact Namesmc PENTAX-A MACRO 1:2.8 50mm
Years of Production1984 ~ 1988
Availabilityused, several times a year
Catalog Number28190
Sold with Hood
Sold with Casehard case: HA-90

Technical Specifications

Optical Formula6 elements in 4 groups
Aperture Rangef/2.8 ~ f/22
Number of Aperture Blades6
Minimum Focusing Distance0.24 m
Maximum Magnification0.5 X
Special Featuresfloating elements, macro lens
Filter Diameter49 mm
Maximum Diameter63 mm
Length50 mm
Weight220 g
Capplastic clip-on cap, 49 mm
Fitting Hood(s)no hood required
Fitting Case(s)hard case: HA-90