I think my issue is that he's implying that by having the ability to shoot with a longer
exposure time will create a better
exposure!
Wrong! with digital it's the other way 'round. A shorter
exposure time technically gives a better
RAW in terms of signal to noise ratio. This is clearly evident with the fact that a long
exposure requires the use of in camera LNR(long
exposure NR).
In colder climates this may generally not be an issue, but if your camera is creating hot pixels or not effective in it's LNR ability(D70s) or if you get a phenomenon known as
amp glow, they can al add up to ruin an image.
A ND filter will not help you get a better balanced
exposure, whereas a CPL will, and a GND will.
An ND filter only slows down your
shutter speed relative to what it would otherwise be for a given
aperture and
ISO value.(but that's being pedantic).
I'm not really having a go at him, although I think someone on
Flickr should point out a few of the errors in his page.
Sometimes no info can be better than wrong info tho.
With no info at hand, you then go out and set on a course of discovery of your own testing and so forth.
With wrong info you wrongly assume that you're doing the right thing!