The OKS9-500-1 lens is purposed for usual film shots.

 Specification of LOMO OKS9-500-1 optical block
Manufacturer   NPO "EKRAN"
Lens system   -
Focal length f' 498.1 mm
Angle of view 2ω' 3°07'
Effective relative aperture f:nэ 1:5.9
Lens length Σd 173.6 mm
Front focal length S -
Back focal length S' 322.4 mm
Flange focal distance Z -
Block length B 460 mm
Block max. diameter D 144 mm
Rear diameter D' -
Front element diameter d1 94.0 mm
Rear element diameter d2 62.0 mm
Mount thread   -
Distance from rear end of the housing
to the focal plane
l -
Aperture blades quantity   ?
Frame size   16x22 mm
Weight   4.6 kg






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