Re: Filter/Speed/Meter & DON'T meter using a Nikon Camera

["Rolland Elliott" <rolland_elliott@xxxxxxxxxxx>]

The problem with using an internal camera meter is that many camera 
manufacturers install a IR blocking filter in front of the silicon photo 
diode making their meters rather useless for IR photography.

I have been fixing Nikon cameras for quite some time and I can tell you from 
personal dismantelling experience that ALL 35mm Nikon cameras have a blueish 
green IR blocking filter over the metering cell. Although, like many people 
have said, you can calibrate your meter, I have found that it only works 
well for bright sunny conditions, not low light. Therefore I have changed my 
view on using internal camera meters. I wouldn't use NIKON camera meters for 
IR light readings because they do NOT meter IR light due to this blocking 
filter.

Take a look at Nikon's F5 brochure. Inside of it they have a camera that is 
cut in half and one can clearly see the blueish green IR block filter over 
the metering cell.

I recently removed the blue green blocking filter from an N90s and it gives 
much more accurate IR exposures.

Most people wouldn't mess around with a $700 camera, but I'm a little 
obsessive about IR photography.

Peace, Rolland



"Light meters are sensitive to Infrared Radiation, but are not calibrated 
for
it.  I use the meter reading through my #25 filter as well as experience to
determine my exposure time."-George

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