LOMO 35BAS22-2, Instruction Booklet

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LOMO
Anamorphic Unit
35BAS22-2
Instruction Booklet
1. USE OF THE UNIT
Anamorphic Unit 35BAS22-2 is intended for shooting wide-screen color and b/w movies onto 35mm
film using Russian cine cameras with distance between film and shutter of 19mm. The lens is
designed to be used within a temperature range of -30 to +40 degrees Centigrade.
2. SPECIFICATIONS
Basic Characteristics Value
Focal length, mm 48
Back apical focal length, mm 34.2
Geometrical relative aperture 1:2
Frame size, mm 18.6 x 21.95
Aspect ratio in the middle of the frame 0.5
Close focus distance, m 1
Dimensions, mm:
length
diameter
165
105
Weight, kg 1.6
3. OPTICS, CONSTRUCTION AND OPERATION
3.1. Optics
Optical design of the anamorphic unit 35BAS22-2 (Figure 1) consists of the lens 1 (lens OKS1-50-1,
F=50mm, f/2) and anamorphic attachment 2. The anamorphic attachment consists of two-lens
spherical compensator 3 (elements 4 and 5) and two cylindrical components (6 and 7). The
components of the attachment and the lens are immovable. Lens 4 of compensator 3 is moved
during focusing.
3.2. Construction
The anamorphic unit consists of two assemblies
– the lens and the attachment. In attachment body 8
elements 5 and 6 are fixed. Holder 9 with lens 7 is screwed into the body. Shooting distance is set
by rotating ring 10 screwed to holder 12 with element 4 by means of screws 11. Ring 13 is marked
with a shooting distance scale. The lens in the focusing mount is connected to the attachment body
by means of bayonet nut 14.
The lens-focusing mount consists of two bushes 15 and 16, the aperture scale 17, nut 18 and the
mount 19.
To change the focusing mount, unscrew screw 20, loosen screws 21, screw off mount 19, screw in
the corresponding replacement mount, and then tighten screws 20 and 21.
Slider 22 is intended to mount the unit to the camera. Screws 21 and 23 are used to fix the unit after
adjustment.