Archived posting to the Leica Users Group, 2005/03/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Might it not be possible that some of the CCD Sensors, such as the ones on the outer edges of the chip be directed at an angle, so that they better match the incoming light rays with the backend of the sensor bending the ray so as to reduce vignetting? AGS ----- Original Message ----- From: animal <s.jessurun95@chello.nl> Date: Thursday, March 17, 2005 4:26 pm Subject: Re: [Leica] Digital cameras with large aperture lenses > I asked Erwin Puts this yesterday and he states that it,s not so > Acording > to him F1 will still be twice as bright as 1.4 . > He also mentioned that his credibility on digital fora is so bad > that he > dare not post on them. > best simon jessurun > ----- Original Message ----- > From: "Don Dory" <dorysrus@mindspring.com> > To: "'Leica Users Group'" <lug@leica-users.org> > Sent: Thursday, March 17, 2005 1:33 PM > Subject: RE: [Leica] Digital cameras with large aperture lenses > > > > Adam, > > Two mutually reinforcing actions are going on to make large aperture > > lenses vignette on digital sensors. The first is the same as on > wide> angle lenses; light rays from the edge of the lens are > striking the CCD > > at a relatively high angle and thus lost on the edge CCD's. The > second> is that a micro lens by nature focuses the light to a > point, however, if > > the light ray is striking the micro lens at a sufficient angle, the > > focus of the micro lens is not on the underlying CCD. > > > > Don > > dorysrus@mindspring.com > > > > -----Original Message----- > > From: lug-bounces+dorysrus=mindspring.com@leica-users.org > > [lug-bounces+dorysrus=mindspring.com@leica-users.org] On Behalf > > Of Adam Bridge > > Sent: Thursday, March 17, 2005 1:50 AM > > To: Leica Users Group > > Subject: Re: [Leica] Digital cameras with large aperture lenses > > > > I don't understand how a microlens affects the full aperture > > performance of a lens. More light is more light isn't it? So how > would> this work? > > > > Adam > > > > > > On Tue, 15 Mar 2005 14:39:16 -0800, Henning Wulff > > <henningw@archiphoto.com> wrote: > >> Regarding the recent discussion about fast lenses not having linear > >> response re: their f/stops, and acting like slower lenses, here > is a > >> recent discussion on dpreview on the issue. Conclusions are similar > >> to the ones voiced here. > >> > >> > http://forums.dpreview.com/forums/read.asp?forum=1029&message=12649209>> > >> -- > >> * Henning J. Wulff > >> /|\ Wulff Photography & Design > >> /###\ henningw@archiphoto.com > >> |[ ]| http://www.archiphoto.com > >> _______________________________________________ > >> Leica Users Group. > >> See http://leica-users.org/mailman/listinfo/lug for more > information>> > > _______________________________________________ > > Leica Users Group. > > See http://leica-users.org/mailman/listinfo/lug for more information > > > > > > _______________________________________________ > > Leica Users Group. > > See http://leica-users.org/mailman/listinfo/lug for more > information > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >