To Evelynn: ND4Aramok::2006-08-14 3:39
I think an ND4 filter is actually a 2 stop (maybe wrong on this one), but to be honest I found that I was still having to underexpose by quite a lot and I think I woudl have been better off buying an ND8 filter.

Found this article

"For example, Tiffen and B+W have 0.3, 0.6 and 0.9 ND filters for reducing one, two and three stops of light. Hoya, on the other hand, uses 2, 4 and 8 to indicate reducing 1 (i.e. 2=21), 2 (i.e., 4=22), and 3 (i.e., 8=23) stops. The two ND filters come with Nikon's Coolpack are of ND4 and ND8 type, which means they reduce two and three stops, respectively. "
from http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/filter/filter-ND.html

Hope that helps. I'm only just starting to use the ND filters, though have had a grey grad for longer, I have found that the grey grad was also not strong enough - so either I don't know when to use them, or don't use them often enough...

Emma
United Kingdom
Title: The RockCanon EOS 350D
The Rock (50) *
Aramok Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 896 W: 101 N: 1501] (5166)
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To Evelynn: ND4 Aramok Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 896 W: 101 N: 1501] (5166)::2006-08-14 03:39
:Re: To Evelynn: ND4 Evelynn Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2025 W: 741 N: 3285] (14454)::2006-08-14 12:07