[alt-photo] Re: Alternative Exposure Unit (no pun intended)

[Michel Debar]

Your results must be interesting, but I have real difficulties interpreting
the graph - due to my colour blindness ... Could you write-up a textual
summary of your results ? Thanks

2010/3/13 Alberto Novo <alt.list at albertonovo.it>

> Peter,
>
>> ... the gels I cut were from a "Lee Filter"lighting gel swatch. Each
>> swatch gel has an attached chart of the transmission spectrum. It shows a
>> transmission graph going from 300 nm up to 800 nm. I made sure that I chose
>> the gels with a high degree of purity in their respective colour, and also
>> that they weren't transparent to UVA.
>>
>
> Have you a detailed figure of their UVA absorption? In the Lee Filters site
> I am not abe to find any technical documentation.
> Most of the UV wavelength involving dichromate and ferric salts sensitivity
> is in the 350-400 mn range.
> As for the Epson R2400 inks, I have published an analisys of their
> absorption in the UVA and visible absorption.
> See http://www.albertonovo.it/scan/epson_inks.html
> Alberto  T
> Alberto
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Michel Debar
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