Gehmann #393 Stick-on (suction cup) Iris for ordinary glasses

Gehmann #393 Stick-on Iris

a mini stick-on iris using rubber suction cup for ordinary glasses
improves depth of field
exceptionally lightweight
iris can be radiused round the sticker and rotated around its support post
The unit at the closest is 0.6mm (0.025inch) and open up to 6.8mm (0.268inch)