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INDUSTAR 69 LENS 2.8/28mm M39 MADE IN USSR 
Lens "Industar-69" (2.8 / 28) - aperture chetyrehlinzovy anastigmat (Figure 1). Lens enlightened chemically. Designed for small-format cameras amateur with an aspect ratio of 18x24 mm. Produced in the frame of the camera for "The Seagull." Large field of view and high luminosity allow you to use the lens for different types of photography, including landscapes, group, sports shooting, to shoot high and extending the horizon of architectural ensembles, for filming indoors for photographing without first accurate focusing and etc. Optical components lens mounted in a special frame.


Main technical data
Focal length, mm - 27.58
Relative aperture - 1: 2.8
Angular field of view, c - 56
Working distance, mm - 27.5
Front focal length, mm - 22.36
Back focal length, mm - 21.94
Transmittance - 0.8
The resolving power, lines / mm
in the center - 44
on the edge of the field - 22
The number of lenses - 4
Diameters of the first surface, mm - 10
Light diameter of the last surface, mm - 8.32

Structural components
The largest diameter of the rim, mm - 48
The length of the frame (with a lid), mm - 25
Connecting thread - PSD 39h1
Landing sizes for attachments
threaded - PSD 22,5h0,5
Weight, g - 64


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