LOMO OKS2-100-2 (2.8/100mm)

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 view2ω'15°30'
Effective relative aperturef:nэ1:3.2
Lens length
Σd75.9 mm
Front focal lengthS-39.4 mm
Back focal lengthS'57.8 mm
Flange focal distanceZ
90.5 mm
Block length
B85.5 mm
Block max. diameter
D54 mm
Rear diameter
D'38 mm
Front element diameter
d137.8 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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