Iris for those who have large fingers or lost a little dexterity over the years
Instead of the usual rotating rings to select the aperture size and engage the filters there are studs to select the colours and the aperture ring has flat sides for easy rotation and large numbers for easy viewing
Colour filters are coloured in light grey, grey, blue, peach and yellow
Iris adjusts from 0.8mm > 1.8mm
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