Thanks, LSXPhotog. But I'm sure it's one that many have thought of before, including Nikon. I assume that a protective curtain was something they already had and it was very cheap (it looks like a mechanical shutter only used for protective purposes and not for photography, so it's kind of "funny" to say they no longer have a mechanical shutter). A full frame high quality ND filter that had to travel in place and out-of-the-way would take up a lot of space, engineering & cost that they probably didn't want to deal with. Canon might feel the same.That's a very clever idea, nice.
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