Re: Melles Griot filter info

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 28 Feb 00 at 15:54, Foamb wrote:

> Basic info on filter from Melles Griot. The substrate is a fused silica
> about 1.5mm in thickness and comes in two sizes.
> 
> 25mm round filter -$78
> 
> 50m square filter -162
> 
> The rep said it is a short pass filter that transmitted in the
> 425nm-885nm range with 50% cut-off at 900nm.

Not sure what the author of that article (see your original note below)
tried to achieve....doesn't sound related to IR at all....it
transmits visible all the way up to IR....it blocks more UV than IR.

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an handheld IR meter. it seems that the meter is disassembled and the
light blue IR blocking filter in front of the photo diode is taken out
and replaced with a #87. also added is a Melles Griot 035WP622 filter
that "cuts out light beyond the film's sensitivity and makes the
metering independent of light source".
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--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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