566 Gehmann rearsight iris with 6-colour filter

Incorporates the patented 510 iris
Adjustable over a wider range of 0.5 - 3.0mm
Filters are of the highest quality optically flat glass in colours:
orange, light green, yellow, medium grey, dark grey and amethyst (purple)
Can be used as iris only
Removable steel thread to add f.e. 0.0 diopter
Instruction manual included