So if I want to use a wide apateur, but the shutter speed indicator is flashing red, if I turn the ND filter on I can (probably) still use the apateur I want? Depth of focus in bright light, right?
Are there any other ways to use it creatively?
I actually use the ND filter a fair amount. The lens on my XZ-1 seems to be sharpest between f/3.5 and f/4.0, and on a bright day at ISO 100, I often need a shutter speed faster than 1/2000s to avoid blown highlights. The ND filter avoids that problem (shutter speed is down to 1/250-1/500s).