On Jul 1, 2012, at 2:53 PM, David Parsons wrote: > What settings did you put in for your calculations. I tried a bunch > of combinations, and didn't get diffraction limiting at f/4. f/8 and > up yeah, but not that low.
Lens aperture f/4.0 airy diameter 5.3um pixel Dia 4.8um I suspect that in real world, with the AA filters it might be closer to f/11 which is an airy dia of 14.7 um LIke I said there's a lot to learn, and it would be too easy to get bogged down in technical trivialities that are overwhelmed by something stupid like the camera focusing six inches off of where you want it to. > > On Sun, Jul 1, 2012 at 5:48 PM, Larry Colen <[email protected]> wrote: >> A few nights ago a friend stopped by with his Nikon D800. He mentioned an >> interesting point, that his camera is diffraction limited at f/4. And so, >> it turns out, is a Pentax K-5 (I'm using their data for a D7000 to find the >> diffraction limit). >> >> http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm/ >> >> They do have some interesting stuff in there, that I'll definitely need to >> go and re-read, such as how the anti-aliasing filter affects all of this. >> Although I'm beginning to suspect that as resolution increases, diffraction >> and lens issues will soon render anti-aliasing as unneeded. If we're >> sampling at twice the diffraction limit, or the lenses resolution, do we >> really need an AA filter? >> >> If I had more skill with a spreadsheet, it would be interesting to graph out >> diffraction limit vs resolution on different sensor sizes. It would also be >> interesting to see where various lenses fall in sharpness. I.e. on my K-5 >> with my FA77, when does the lens, the sensor or diffraction limit resolution? >> >> The more I learn about photography, and what is required to maximize the >> technical quality of my photos, the more tempted I am to just quit worrying >> about how sharp they are, and just have fun taking snapshots. >> >> -- >> Larry Colen [email protected] sent from i4est >> >> >> >> >> >> -- >> 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. > > > > -- > David Parsons Photography > http://www.davidparsonsphoto.com > > Aloha Photographer Photoblog > http://alohaphotog.blogspot.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. -- Larry Colen [email protected] sent from i4est -- 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.
