Archived posting to the Leica Users Group, 2003/09/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Sorry to disrupt the discussions, I just want to reply to this, don't pay attention, don't flame, no website upgrade here, no investor asked fraudulously. The problem of the angular tolerance is not so much the angle that covers the field/subject in front of the lens, but rather well the size of the exit pupil of the lens, and its distance to the picture plane. the biggest the aperture of a lens, the biggest its exit pupil, the biggest the cone of light coming on the picture plane (for a set distance). And the closest the rear element/exit pupil of a lens to the film plane, the biggest too the cone of light coming on the picture plane. that's why maybe all the new Nikon lenses produced for digital are never more than f/2.8. This point the most difficult leica-M lenses: namely the Noctilux (which has a cone of light in the center of +-30° (60° in total so), but less in the corner quite strangely), and the most recessed lenses, namely the 21 and 24mm asph though 2.8 (which have a rather narrow cone of light in the center, due to their rather not so high aperture (2.8), but shows very high angular incidence in the corner (34° at max)). Best Gregoire - ----- Original Message ----- From: "Henning Wulff" <henningw@archiphoto.com> To: <leica-users@mejac.palo-alto.ca.us> Sent: Friday, September 26, 2003 6:48 AM Subject: Re: [Leica] R 19 2nd vers. on EOS-300D (aka Canon Rebel Digital) > At 2:04 PM -0700 9/25/03, Douglas Herr wrote: > >Jim Hemenway <Jim@hemenway.com> wrote: > > > >> Someone, I don't remember who, said that the old 19mm will work but not > >> the new version, the one with the filters. > >> > >>Topher wrote: > >> > >>> Is it possible? Has anyone tried yet? > >> > > > >As I recall it depends on the body. Some bodies i.e. those with > >smaller mirrors corresponding to smaller chips can handle the newer > >19mm lens. > > In particular, the Digital Rebel has a new mirror hinge geometry > which allows lenses to be closer to the sensor. All R lenses should > work with this body. > > -- > * Henning J. Wulff > /|\ Wulff Photography & Design > /###\ mailto:henningw@archiphoto.com > |[ ]| http://www.archiphoto.com > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html > - --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.521 / Virus Database: 319 - Release Date: 24/09/2003 - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html