This one is more to the point: http://www.digitalversus.com/guide-diffraction-camera-sensors-article-1017.html
(Yes, I have better things to do but I'm waiting for my student to get back from lunch so she can practice her talk.) On Tue, Jul 19, 2011 at 12:41 PM, Steven Desjardins <[email protected]> wrote: > Here's what I found: > > "Typically the sensor size is 1/5.5 that of 35mm film, thus the limit > for the onset of visible diffraction limit for 12 megapixels is > f/2.4. Since only one small-sensor camera currently has a lens that > fast, this means that small cameras are always diffraction limited and > that megapixel counts much above about 12—which is currently > offered—are almost pointless. This observation explains why typical > small cameras do not even allow f-stops smaller than f/8: at f/8 the > onset-of-diffraction limit is 450 lines, corresponding to about 1.5 > megapixels. > > The author has also observed this effect: pictures taken at f/8 are > visibly, disappointingly less sharp than those taken at wider > apertures. I have started using a pocket camera with manual override > to assure that I use apertures wider than about f/5, and preferable > much wider, whenever possible." > > The site is: > http://www.northlight-images.co.uk/article_pages/guest/physical_limits.html > > On Tue, Jul 19, 2011 at 12:28 PM, Steven Desjardins <[email protected]> wrote: >> It's an interesting point. Mu43 lenses hit their sweet spot around f4 >> and diffraction effects are rearing their head above f8. I may go >> agoogling about this. >> >> On Tue, Jul 19, 2011 at 12:21 PM, P. J. Alling >> <[email protected]> wrote: >>> It's a recording device. If he lenses are good then everything in you photo >>> will be sharp, no distracting out of focus areas. Now you can take this >>> with a grain of salt, because it's quite likely I did the math wrong but the >>> f 1.9 Standard (8mm), lens would have the same lens opening diameter, wide >>> open as a 35mm lens would have at f ~147. Not to mention that the 35mm lens >>> on an APS-C sized sensor, (or film for that matter), would be suffering from >>> serious diffraction effects. I don't see how diffraction isn't a major >>> problem for the Q camera system. >>> >>> On 7/19/2011 7:50 AM, Steven Desjardins wrote: >>>> >>>> It's overpriced of course, but I actually think it could be a very >>>> creative tool. That K7 and all its wonders are often sitting in the >>>> bag at home. >>>> >>>> On Tue, Jul 19, 2011 at 1:21 AM, Christine Aguila<[email protected]> >>>> wrote: >>>>> >>>>> Neato! Thanks for posting, Godfrey! Cheers, Christine >>>>> >>>>> >>>>> >>>>> ----- Original Message ----- From: "Godfrey >>>>> DiGiorgi"<[email protected]> >>>>> To: "Pentax-Discuss Mail List"<[email protected]> >>>>> Sent: Sunday, July 17, 2011 9:58 PM >>>>> Subject: Pentax Q photos >>>>> >>>>> >>>>>> http://www.flickr.com/photos/n00bs/5943610162/in/set-72157627083831739/ >>>>>> >>>>>> And there's a K1 in the set... >>>>>> >>>>>> -- >>>>>> Godfrey >>>>>> godfreydigiorgi.posterous.com >>>>>> >>>>>> -- >>>>>> PDML Pentax-Discuss Mail List >>>>>> [email protected] >>>>>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>>>>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>>>>> follow the directions. >>>>>> >>>>> >>>>> -- >>>>> PDML Pentax-Discuss Mail List >>>>> [email protected] >>>>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>>>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>>>> follow the directions. >>>>> >>>> >>>> >>> >>> >>> -- >>> Where's the Kaboom? There was supposed to be an Earth-shattering Kaboom! >>> >>> --Marvin the Martian. >>> >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >>> >> >> >> >> -- >> Steve Desjardins >> > > > > -- > Steve Desjardins > -- Steve Desjardins -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
