On Jun 14, 2011, at 2:36 PM, Mark Roberts wrote: > William Robb wrote: > >> Igor, filters aren't all that spectrum specific, and tend to be cut >> filters, in that they don't pass any spectrum below a particular >> wavelength (which will vary from filter to filter). >> UV florescence has been a problem since the dawn of electronic flash. A >> lot of things reflect a disproportionate amount of UV light. > > Mr. Robb speaks the truth. And note that fluorescence involves > absorbing light of one wavelength (ultraviolet) and re-emitting the > energy at *different* wavelengths (in the visible spectrum).
So it may be necessary to put a UV filter over the flash, not over the lens. -- Larry Colen [email protected] sent from i4est -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
