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

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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

Edited on Dec 04, 2007 at 03:35 AM

Dec 03, 2007 at 06:17 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.

Edited on Dec 04, 2007 at 03:35 AM

Dec 03, 2007 at 06:27 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)

Edited on Dec 04, 2007 at 03:35 AM

Dec 03, 2007 at 06:33 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 ;-)

Edited on Dec 04, 2007 at 03:35 AM

Dec 03, 2007 at 06:53 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.

Edited on Dec 04, 2007 at 03:35 AM

Dec 03, 2007 at 07:48 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 04, 2007 at 03:35 AM


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