Carl Zeiss Jena Flektogon 20 mm f/ 4 Lens Manual
If this spanner ring is too tight the auto aperture mechanism will bind and not close down, especially for
wider apertures (may have to back off later). The lens will come apart into 2 main components, the lens
assembly and the focus/release assembly. A spacer ring around the lens assembly is loose and can fall off
the assembly (an important item for attaining precise infinity focus later).
wider apertures (may have to back off later). The lens will come apart into 2 main components, the lens
assembly and the focus/release assembly. A spacer ring around the lens assembly is loose and can fall off
the assembly (an important item for attaining precise infinity focus later).
Observe the release/focusing assembly, with the inner helical ring in place. Note that the cocking
mechanism moves a quarter circle (running from about 10 to 2 o’clock in the above photo), then pops out a
pawl. On release the pawl pops back in.
mechanism moves a quarter circle (running from about 10 to 2 o’clock in the above photo), then pops out a
pawl. On release the pawl pops back in.
Don’t perform the following separation if at all possible. To separate the release assembly from the
focusing assembly, remove the focus stop screw, a large black pan head screw inside and screw off the
focusing assembly by turning counterclockwise—the helical drives up until it dethreads (when it is
focusing assembly, remove the focus stop screw, a large black pan head screw inside and screw off the
focusing assembly by turning counterclockwise—the helical drives up until it dethreads (when it is