The only real situation I have ever encountered where nd filters would be nice is when I want to slow down my shutter speed. I don't often run into the problem of not being able to have a large enough aperture, but that could happen occasionally. In most of the cases where I want a longer shutter speed, a 1 stop decrease wouldn't make a significant difference.
"I don't know" how many stops I typically need to extend the exposure by in general, but I do know that it's rarely a single stop.
After thinking about it, I think I will go ahead and get all three filters because I could stack them to come up with whatever configuration I need, and the single stop would give me finer control of that. I could have anywhere between one and six stops if I get all three. If I didn't get the .3, I would be limited to 2,3, and 5 stops only.
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