On Sep 26, 2013, at 4:23 PM, Larry Colen <[email protected]> wrote: > On Thu, Sep 26, 2013 at 03:28:50PM -0700, Godfrey DiGiorgi wrote: >> You don't read many industry journals. >> >> >> Just like the statement that "AF can focus more precisely". Hogwash. >> Critical focus achieved with AF cannot be more precise than critical focus >> achieved with manual focus because they are EXACTLY the same thing: critical >> focus. > > OK, how about AF can reach critical focus, or be closer to critical focus > faster than doing it manually, in a much wider range of circumstances.
I would be happy to agree with "Well engineered auto-focusing systems can reach acceptable focus faster and more consistently than manual focusing systems on average targets with lenses in the focal length and maximum aperture range that they were designed for, particularly when the manual focusing systems are of a mediocre quality." I'm happy to agree with that because I have direct experience of that situation. I find all AF systems to be somewhat limited in the range of scene types that they can be critically accurate for, where a well engineered manual focusing system can be 100% critically accurate for all scene types. The reason for this is that the manual focusing systems rely on a much more powerful sharpness discriminating engine. However, when the manual focusing system is of mediocre quality, all bets are off. > I'm also willing to bet that most of the people who own Leicas are > graduates of the Dunning-Kruger school of expert photography. Dredge that up from Wikipedia, did you? LOL! Larry, I'm willing to bet that you know few Leica owners, and choose to dis those who buy them based on your prejudices about the cost and cachet of the Leica brand. No other brand gets as much prejudicial commentary as Leica, which I suspect is a matter of brand envy rather than anything to do with the quality of the products. Godfrey -- 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.
