Will phase focusing go the way of the dinosaur?
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From: David J Taylor on 7 Jun 2010 09:46 "SMS" <scharf.steven(a)geemail.com> wrote in message news:4c0cd52e$0$1654$742ec2ed(a)news.sonic.net... [] > The real question is if there will be any more P&S cameras that include > contrast detect AF. I only know of one (a Ricoh model) that ever > existed. [] A typo, I guess?
From: Pete on 7 Jun 2010 10:17 On 2010-06-07 13:28:42 +0100, whisky-dave said: > "GMAN" <Winniethepooh(a)100acrewoods.org> wrote in message > news:feVOn.196202$ot7.172634(a)en-nntp-16.dc1.easynews.com... >> In article >> <7055b134-9c54-4649-b6d4-cb3b3edf4826(a)q36g2000prg.googlegroups.com>, >> Twibil <nowayjose6(a)gmail.com> wrote: >>> On Jun 6, 1:04=A0pm, RichA <rander3...(a)gmail.com> wrote: >>> >>> "Will phase focusing go the way of the dinosaur?" >>> >>> You mean "will phase focusing eventually evolve into birds and remain >>> very much on the scene for the forseeable future?" >>> >>> Seems unlikely. >> There wasn't any T Rex's left after the great extinction to evolve into the >> chicken!!! > > So how did KFC evolve from KFT.Rex ? The only records we have that may shed some light on these mysteries is The Flinstones. -- Pete
From: LOL! on 7 Jun 2010 10:59 On Mon, 07 Jun 2010 04:16:59 -0700, SMS <scharf.steven(a)geemail.com> wrote: > >The real question is if there will be any more P&S cameras that include >contrast detect AF. I only know of one (a Ricoh model) that ever existed. LOL!!!!!!!!! There you have it folks. A perfect example of the sum-total of knowledge of this pretend-photographer SMS troll. LOL!!!!!!!!!!
From: SMS on 7 Jun 2010 12:13 On 07/06/10 6:46 AM, David J Taylor wrote: > "SMS" <scharf.steven(a)geemail.com> wrote in message > news:4c0cd52e$0$1654$742ec2ed(a)news.sonic.net... > [] >> The real question is if there will be any more P&S cameras that >> include contrast detect AF. I only know of one (a Ricoh model) that >> ever existed. > [] > > A typo, I guess? Oops, sorry. Yes, s.b. "The real question is if there will be any more P&S cameras that include phase detect AF. I only know of one (a Ricoh model) that ever existed."
From: Ray Fischer on 7 Jun 2010 13:34
James Nagler <jnagler(a)spamproofed.net> wrote: > "David J Taylor" >>"RichA" <rander3127(a)gmail.com> wrote in message >>> Forget for the moment the benefits of going away from phase focusing, >>> such as much lower cost going to contrast focusing. Phase's main >>> important claim to fame is speed. But that is diminishing, or >>> contrast is improving. The main problem with phase focusing is the >>> constant problems with back or front focusing with various lenses, >>> doesn't matter what brand of camera. This is a pain, one that >>> contrast focusing apparently does not have or if it does, the >>> incidence is very small. Most decent DSLR's now come with >>> compensation features for this, but who wants to have to go though the >>> elimination process for each lens they own and how often has this >>> compensation not even been enough, or consistent? >> >>You appear to forget that phase-focusing provides an instantaneous and >>continuous measurement not only of the direction of the focus error, but >>its magnitude as well, so that the camera knows which direction to move >>the lens, and by exactly how much to move it. One lens move. Focus done. >> >>Contrast focus, by comparison, takes time to evaluate how much in focus an >>image is, moves the lens in an arbitrary direction, evaluates the focus >>once again, has a 50% chance of finding the focus is worse so has to move >>the lens in the other direction, has to evaluate the focus again, move the >>lens, etc. etc., until the focus is worse again, so it's moved past the >>point of best focus, and finally has to move the lens back to /about/ the >>correct focus. > >You appear to forget that some contrast focusing cameras are just as fast >as phase focusing cameras today. Now you're just resorting to stupid lies out of desperation. -- Ray Fischer rfischer(a)sonic.net |