Quote:
Originally Posted by sil
Even with the film you are taking very short exposures (I can easily shoot hand held with 1,500mm focal lengths), a neutral density filter will still let through some of the harmful (non-visual) portions of the light spectrum which can damage your camera sensor if you get your exposure times wrong.
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Yep, and I've noticed many photographers are tempted to look through the view finder when they have plain ND filters on the camera. Very bad for the eyes if the ND filters allow UV light to pass through (as many do) - it's like looking at a partial solar eclipse without protection.