Archived posting to the Leica Users Group, 2003/09/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]LUGers What is the expression; "Figures don't lie, but__________"? Jerry Grégoire Vandenschrick wrote: > you read it right, the CMOS WITH microlenses cannot handle the very wide > cone of light produce by wide aperture optics. This is due to the microlens > itself. Did you read all the description of the differnet technologies > purposed to achieve a high fill factor? this is not what is used by Fill > Factory. Maybe I miss the point here, but I don't plan to use the microlens > array, because of that, but rather well the N-Well technology, wich frees > the front of the CMOS form any microlens array, recovering so a more wide > cone of light. And if this cone is not wide enough, then add the > microfresnel array. > > Actually, I took a cone of +20° around the optical axis for the N-Well CMOS. > This is based on what Kodak gives for the angular tolernace of their CCD > WITH microlens. So, I'm rather tight on this, I'm practically sure the Fill > Factory CMOS has in fact a more wide cone of light, but I took this to be > sure. > > I would like to point something I forgot to tell. With such a cone of light > of 20° around the optical axis (20° on both side, so a total angle of 40° > ok?) even with the Microfresnel, one cannot achieve to gather all the light > coming from the Noctilux (which is in the center of 30° around the optical > axis, +60° on the total!). The Noctilux is in fact not a problem in the > corner, but rather well in the center! Now, if we take the risk to consider > that the Fill Factory N-Well CMOS has an angular tolerance of + - 30°, It is > compliant with the Noctilux. In the corner, it is easily achieved by the > microfresnel array. > > Do I miss something about your comment? I'm not sure about what you mean > exactly. > > Best > > Greg > ----- Original Message ----- > From: "Douglas Herr" <telyt@earthlink.net> > To: <leica-users@mejac.palo-alto.ca.us> > Sent: Thursday, September 25, 2003 5:55 PM > Subject: Re: [Leica] DigiBack Website updated, maybe the philosophal sensor > for Leica-M lenses > > > Gr?goire Vandenschrick <gregoire.vds@skynet.be> wrote: > > > > > the sensor compliant with the angles produced by Leica-M lenses could be > > > done with existing technical solutions, go and have a look: > > > > > > on the flapback page, follow the "high resolution CMOS with microfresnel > > > array" link, or go directly to > > > > > > http://users.skynet.be/fa420324/pages/CMOS.htm > > > > Quoting from the FillFactory description of the microlens CMOS chip: > > > > "not efficient with wide-aperture optics" > > > > > > Doug Herr > > Birdman of Sacramento > > http://www.wildlightphoto.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: 6.0.520 / Virus Database: 318 - Release Date: 20/09/2003 > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html