Archived posting to the Leica Users Group, 2005/03/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 [mailto: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 > /###\ mailto: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