Futura Tele-Elor 5.6/90
90mm telephoto lens produced by Futura Kamerawerk in Freiburg, Breisgau, Germany during the (likely late) 1950's.
The aperture is always stopped down to at least f/5.6; it would likely open out as wide as f/4 if allowed. It's likely this means the lens is at full sharpness "wide open".
- Futura threaded mount (S variant)
- 8-bladed diaphragm; curved blades, circular from f/5.6 to f/22.
- E40.5 filter size
|Tele-Elor 5.6/90 mount|
image by Ryan Volpe (Image rights)
This particular lens (serial
T77xx) has a non-backwards-compatible lens mount, hereby referred to as the S variant.
This incompatibility takes the form of a tab at 9 o'clock (looking at the lens from the flange side) which mates with a groove in the shutter's shroud baffle; earlier cameras lack this groove and attempting to mount this lens will damage their baffling. This tab (visible to the left) allows the 50mm focus helicoid to drive the longer lens through its travel.
This lens has been tested and will mount on:
- Futura P
- Futura S III (likely)