On Wed, 1 Jan 2003 15:20:38 +0100, philip@pch.home.cs.vu.nl (Philip Homburg) wrote:

>In article <3e13b7d2.2239450@newsstand.cit.cornell.edu>,

>Neuman - Ruether <d_ruether@hotmail.com> wrote:

>>Yes - I forgot to add the very important, "in daylight"

>>to my post, which is close enough for practical purposes...

>You wrote:

>>At least for the colors of B&W filters, like dark yellow

>>(FF2 = 1 stop), orange (FF4 = 2 stops), and red (FF8 = 3

>>stops),

>

>>For my gear and films,

>>I found the meter in error (underexposure) by about 1/2 the

>>FF for each of the colors above compared with the grey

>>no-filter exposure...

>

>So if I understand things correctly, dark yellow (FF2), under exposure by

>FF1 = 0.5 stop, orange (FF4), under exposure by FF2 = 1 stop,

>red (FF8), under exposure by FF4 = 2 stops.

>

>But that doesn't make sense. It sort of means that meter does not detect de

>difference between the orange and the red filter. When going from

>orange to red, you need one stop extra exposure, but the meter gives one

>stop extra under exposure (i.e. no change).

I was incorrect... The numbers are .5-stop, 1-stop, and

1.5-stop, 1/2 the normal *compensation* for each filter...

>If I understand things correctly, this would imply that the meter is almost

>completely insensitive to the red/orange/yellow part of the spectrum.

>

> Philip Homburg

The Nikon camera meters I checked did show the errors

above compared with "flat"... Since this is so easily

checked (as described earlier in the thread, which your

post has unfortunately been detached from), I recommend

people who regularly use strongly-colored filters or who

shoot strongly-colored subjects that occupy much of the

image (metering) area try the tests... BTW, a variation

of .5 to 1.5 stops from flat I would not describe as

indicating "complete insensitivity" of the meter to

these colors...;-)