Archived posting to the Leica Users Group, 2003/09/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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