SETH escribió:
> >
> > L39 is a Nikon designation for a UV-filter.
>
> It's not just Nikon. All Pentax UV filters are designated L39. The
> original designation was probably assigned by Kodak or some other
> early photo company.
>
The reason for that name is that such kind of filters avoid the
transmission of lightwaves shorter than 390 nanometres.
For the same reason, filters which cut UV under 370 nm are called L37.
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Carlos Royo
[EMAIL PROTECTED]
Zaragoza (Aragon) - Spain
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