LOMO T-43 40/4 specifications
Optical scheme: triplet
Focal length: 41.78 mm
Relative hole: 1: 4
Field of view (35 mm film): 55 degrees
Aperture: 8 petals, black, shiny
Diaphragm Limits: F / 4-F / 16
Rear focal length: 35.52 mm
Light transmission coefficient: 0.87
Resolution (lin / mm, center / edge, test on the film KN-1): 45/19
Thread diameter: 21 mm
The thread under the filter M35.5 × 0.5.
Thread diameter for filters: 35 mm