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----- Original Message ----- From: "P.J. Alling" <webstertwenty...@gmail.com> To: "PDML" <pdml@pdml.net> Sent: Saturday, September 13, 2014 8:44:27 AM Subject: Re: Count number of lens surfaces from a photo Here's the optical formula you can judge for yourself. http://www.bdimitrov.de/kmp/lenses/zooms/_optics/17-70f4.gif On 9/12/2014 10:11 PM, Igor PDML-StR wrote: > > How many surfaces does this lens have? > http://42graphy.org/misc/Baikal/_IR29947.jpg > > (for those ready to cheat: it's Pentax 17-70/4 at f/22) > > I didn't expect to see so many reflections from all the surfaces. > That's what I assume was the reason for all those spots. Right? > > Igor > > > -- I don't want to achieve immortality through my work; I want to achieve immortality through not dying. -- Woody Allen -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
