ND 2.5-500 Dörr filter
Filter of 82 mm diameter, adapted to 24-70 mm and 16-35 mm lenses.
This filter is variable
from 2.5 = 40% transmittance = aperture reduction of 1.4 stops
to 500 = transmittance of 0.2% = aperture reduction of 9 stops
3 CHF/day
