The OKS5-250-1 lens is purposed for usual film shots.

 Specification of LOMO OKS5-250-1 optical block
Manufacturer   NPO "EKRAN"
Lens system   -
Focal length f' 250.0 mm
Angle of view 2ω' 6°12'
Effective relative aperture f:nэ 1:2.9
Lens length Σd 110.6 mm
Front focal length S -
Back focal length S' 151.5 mm
Flange focal distance Z -
Block length B 230 mm
Block max. diameter D 135 mm
Rear diameter D' -
Front element diameter d1 89.5 mm
Rear element diameter d2 56.5 mm
Mount thread   -
Distance from rear end of the housing
to the focal plane
l -
Aperture blades quantity   ?
Frame size   16x22 mm
Weight   3.1 kg






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