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The Calumet filter is a lens filter made from Japanese AGC glass that does not affect color temperature and is resistant to mechanical damage. It reduces light by 2 EV and allows for a four times longer exposure.
It features a hydrophobic, oleophobic, scratch-resistant and anti-reflective coating. The aircraft-grade aluminum frame is 3.3 mm thick and has special grips for easy installation and removal, as well as double threading for using two filters at the same time.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.