Archive 2007 · B+W 4.0 ND filter...how many f-stops

The Image
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p.1 #1 · B+W 4.0 ND filter...how many f-stops

Hi everyone, i bought an B+W ND filter, its alot of F-stops being i cant even see through it, what i was wondering is how many F-Stops this filter is, its a 4.0

Dec 03, 2007 at 01:17 PM

Steve Spencer
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p.1 #2 · B+W 4.0 ND filter...how many f-stops

If it is a 4X (i.e., a #102 ) it is darkens the image 2 F-stops. I hope this helps.

Dec 03, 2007 at 01:27 PM

Tetsuo
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p.1 #3 · B+W 4.0 ND filter...how many f-stops

According to the B&H page for these filters:

Neutral Density factors
� ND.3 (exposure adjustment = 1 stop, reduces ISO 1/2)
� ND.6 (exposure adjustment = 2 stops, reduces ISO 1/4)
� ND.9 (exposure adjustment = 3 stops, reduces ISO 1/8)
� ND 1.8 (exposure adjustment = approx. 6 stops, transmits 1% of light,)
� ND 3.0 (exposure adjustment = 10 stops, transmits 0.1% of light)
� ND 4.0 (exposure adjustment = 13-2/3 stops, transmits 0.01% of light)
� ND 6.0 = (exposure adjustment = approx. 20 stops)

Dec 03, 2007 at 01:33 PM

The Image
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p.1 #4 · B+W 4.0 ND filter...how many f-stops

Thanks, wow mine is 13 stops, i can look the sun straight in the eye with that eh ;-)

Dec 03, 2007 at 01:53 PM

Bearmann
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p.1 #5 · B+W 4.0 ND filter...how many f-stops

Thomas McConville wrote:
Thanks, wow mine is 13 stops, i can look the sun straight in the eye with that eh ;-)

Not recommeneded, as I think it only blocks the visible light, not UV, which could result in retina damage. You need special lenses to look at the sun safely.

Dec 03, 2007 at 02:48 PM

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p.1 #6 · B+W 4.0 ND filter...how many f-stops

Thank you Bearman, i didnt know that...you probably saved me a pair of eyeballs.

Dec 03, 2007 at 10:35 PM


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