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Message: <blockquote data-quote="BackdoorArts" data-source="post: 328140" data-attributes="member: 9240">I have an ND400 in my bag, and ND 2, 4 & 8 on my shelf (1, 2 & 3 stops).  If I think I'll have a need to stack there's a good chance I'll only throw the 3 stop in my bag as I've rarely run into a situation where I wanted something more restrictive.  I don't like stacking more than 2 pieces of glass, particularly on a bright day when the chances for light reflecting between the two is increased.And good call from Sparky on the covering of the eyepiece.  With any kind of long exposure in a lit environment you run the risk of light leak, so either use the plastic cover, or lay a piece of cloth over the top of the eyepiece before depressing the shutter - just make sure that it won't catch any breeze that might be there and cause camera movement.  I'll often just hold a hat over it without touching the camera.</blockquote>