Specification of Cooke Telepanchro 4/203mm
The Cooke Telepanchro 4/203mm lens is purposed for usual film shots.
| Manufacturer | "Rank, Taylor & Hobson" (England) | |
| Lens system | - | |
| Focal length | f' | 203.9 mm |
| Angle of view | 2ω' | 7°40' |
| Effective relative aperture | f:nэ | 1:4.3 |
| Lens length | Σd | 100 mm |
| Front focal length | S | -311.5 mm |
| Back focal length | S' | 66.9 mm |
| Flange focal distance | Z | 52.1 mm |
| Block length | B | 162 mm |
| Block max. diameter | D | 84 mm |
| Rear diameter | D' | 41 mm |
| Front element diameter | d1 | 52 mm |
| Rear element diameter | d2 | 32 mm |
| Mount thread | - | |
| Distance from rear end of the housing to the focal plane |
l | 33.4 mm |
| Aperture blades quantity | ? | |
| Frame size | 16x22 mm | |
| Weight | 1.05 kg |
