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Old Sep 10, 2004, 11:59 AM   #1
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Ok, so I went to BH Photo to get myself a Neutral Density Filter. Silly me, I thought that would be an easy task. BH Photo has a Neutral Density filter for 19.99, I figure that's a good price. What got me was there are 3 different filters, 1, 2, and 3.

style="BACKGROUND-COLOR: #000000"So now I am looking for some input on which I should get. I was going to opt forthe 2, just to be in the middle, but I'm afraid that may be too much.

style="BACKGROUND-COLOR: #000000"Again, any help would be great.

style="BACKGROUND-COLOR: #000000"Dave
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Old Sep 10, 2004, 12:33 PM   #2
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Each increment of the number associated with an ND filter doubles the light loss.

ND=1 means you loose 50% of the light (50% remains)

ND=2 means you loose 75% of the light (25% remains)

ND=4 means you loose 94% of the light (6% remains)

You can stack an ND1 and an ND 2 to get an ND 3 (88% loss, 12% remains)

Another way to think of this is than anND 1 filter on a camera set to ISO 100 is the same as a camera with ISO 50, and ND 2 would be the same as ISO 25,...
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Old Sep 10, 2004, 12:35 PM   #3
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1,2 and 3 should correspond with the number of stops of light the filter blocks. I'm more familiar with the 0.2, 0.4 and 0.9 numbers.

What you choose depends on what your intents are with using the filter.
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