Archived posting to the Leica Users Group, 2004/06/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]----- Original Message ----- From: "Doug Herr" <telyt@earthlink.net> To: "Leica Users Group" <lug@leica-users.org> Sent: Monday, June 21, 2004 2:41 AM Subject: Re: [Leica] Erwin on the new M-50/1.4 ASPH/digital sensor sizequestion > on 6/20/04 3:09 PM, animal at s.jessurun95@chello.nl wrote: > > > When the sensor size changes so does the focal length doesn,t it?Why does > > the aperture stay constant ?Isn,t the f number a ratio of diameter divided > > by focal length? > > Simon > > > > The focal length doesn't change. What changes is how much of the image > circle is used. It's a crop factor, not a focal length factor. > > Doug Herr > Birdman of Sacramento > http://www.wildlightphoto.com > > >Thanks simon