ND chart, and how it affects shutter speed

[mjs1973]

I got this chart from the Martin Bailey Photography podcast yesterday, and I thought that others may find it usefull, but I'm not sure where to post it. Mods, please feel free to move this to where ever you feel it fits best.

[another view]

Quite the comprehensive chart - thanks for posting! Since you don't mind I'm going to put it under Help, where ND filters are brought up occasionally.

[mjs1973]

The Help fourm works for me. This is where I was going to post it originally, but wasn't sure. Thanks Steve.

[Xia_Ke]

Damn, that's quite the chart Great post Michael :thumbsup:

[readingr]

Michael,

I was looking at this and hit a mental block In row 5 it states

2 X ND4 (4 stops) = ND2 (1 stop) + ND3 (1.5 stops) which I make out to be 2.5 stops not the 4 it claims.

What am I missing?

Roger

[mjs1973]

That's a good question Roger. I wonder if it's a misprint, and that the ND3 in that row should actually be ND8 which would be 3 stops, to make the total of 4 stops.