Archived posting to the Leica Users Group, 2000/07/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]A NM is one nanometer or 0.0000000001 meter. other words pretty small. - -----Original Message----- From: Shel Belinkoff [mailto:belinkoff@earthlink.net] Sent: Tuesday, July 25, 2000 10:23 AM To: leica-users@mejac.palo-alto.ca.us Subject: Re: [Leica] Leica or B+W Filters Austin Franklin wrote: > One of the advantages of the Heliopan 'Standard Coating' filters, is they > are SO thin. I do not know if the multi-coated ones are thin also, they > may be... How thin are the Heliopan coatings? B+W coatings are, according to the B+W catalog I have here, about 1/4 wavelength (and a chart is shown showing the wavelength in the 400nm - 700nm range). I don't know what a "nm" is, but since we're discussing wavelengths of light, I'd imagine it to be very small. - -- Shel Belinkoff mailto:belinkoff@earthlink.net