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