Re: Coloured filters and EIR

[Ben Kreunen <ben@xxxxxxxxxxxxxxxxxxxxxxx>]

>This may read a little like a marketing plug so please delete this message
>and read no further if you may be irritated by the contents :-)


Shockingly shameless plug...  ;-)  Although a spectral analysis is the only 
way to prove that a filter is what it says it is....

and so tying 2 recent posts together... while looking for some formulas on 
depth of field I happened across an old Kodak book on filter specs...  Of 
curiosity were some of the 90 series filters which are obviously IR 
transmitting but with some transmittance in the blue/green region. Anyone 
tried any of these?

#93 (10% blue + 720nm+), #94 (10%green + 750nm+)used for densitometric 
measurement of colour film & paper

Cheers

Ben

===================================
http://www.bigbenpublishing.com.au/
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