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Post by Rachel on Sept 26, 2006 6:00:08 GMT -5
I thought I understood these but I have a neutral density filter marked ND4 but taking a reading through it with a handheld meter shows only a one stop difference in exposure. Any ideas?
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orwopan
Contributing Member
Posts: 35
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Post by orwopan on Sept 26, 2006 7:26:38 GMT -5
Rachel,
a ND4 cuts off two f-stops, reducing film sensitivity from e.g. ASA 800 to ASA 200. re-checked this with a KMZ ND 4 and Zenit 122. Maybe some stray light when using your handheld?
see ya,
Philipp
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Post by nikonbob on Sept 26, 2006 7:49:43 GMT -5
I had the same experience when checking with a handheld meter and the only answer that I could think of was the one given by Philipp.
Bob
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Post by kamera on Sept 26, 2006 18:48:33 GMT -5
Were you going to use on a RF or SLR? That is the nice thing about TTL metering...do not have to worry about the factor.
Ron Head
Kalamazoo, MI
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Post by Rachel on Sept 29, 2006 15:29:50 GMT -5
Thanks all. I thought it should be two stops. I did hold the meter cell very close to the filter. I'll try again.
Ron, I was going to use it with my Exa 1 so no TTL metering. The fastest shutter speed is 1/175th and both it and 1/125th speeds are unreliable. I'll see if I can fit it to one of my TTL metered SLRs and see what the results are.
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