Many operators use OKS1-100-1 (2/100mm) lens. But this lens has not very high image quality. That is why it is recommended to use OKS2-100-1 lens (2.8/100mm) purposed for 70mm film but having different focusing mount and smaller front element. Such lens was named OKS2-100-2. It has higher image quality and is used in anamorphic block 35BAS22-2 as well.

Unfortunately, this lens version is relatively rare. I had only couple of them.

Specification of LOMO OKS 2-100-2 optical block 
Manufacturer
NPO "EKRAN"
Lens system

-
Focal length
f' 99.7 mm
Angle of view 2ω' 15°30'
Effective relative aperture f:nэ 1:3.2
Lens length
Σd 75.9 mm
Front focal length S -39.4 mm
Back focal length S' 57.8 mm
Flange focal distance Z
90.5 mm
Block length
B 85.5 mm
Block max. diameter
D 54 mm
Rear diameter
D' 38 mm
Front element diameter
d1 37.8 mm
Rear element diameter
d2
28.3 mm
Mount thread

-
Distance from rear end of the housing
to the focal plane
l
51.3 mm
Aperture blades quantity

?
Frame size

16x22 mm
Weight
320 g

 

 

 

 

 

 

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