530-0 Gehmann diopter 0.0x combined with rearsight iris
Diopter 0.0x with rerasight iris 510, but without magnification  Please see description of 50300-0
570-0 Gehmann diopter 0.0x combined with 6-colour filter with rearsight iris
Diopter 0.0x with 6-colour filter with rerasight iris 566, but without magnification  Please see description of 50300-0
575-0 Gehmann diopter 0.0x combined with iris, 6-colour filter and twin polariser (565)
Diopter 0.0x combined with iris, 6-colour filter (orange, light green, yellow, medium grey, dark grey and amethyst) and twin polariser 565, but without magnification  Please see description of 50300-0