Den 24. jan. 2011 kl. 21.30 skrev Paul Stenquist: > On Jan 24, 2011, at 3:00 PM, steve harley wrote: > >> On 2011-01-23 15:51 , Paul Stenquist wrote: >>> PhotoShop controls do the same thing the shift and tilt lenses do -- they >>> rearrange reality. >> >> that's the "same thing" in the sense that bird eggs and kangaroo pouches are >> the same thing; i'm not a purist nor very interested in tilt/shift, but i do >> know Photoshop can't vary the focus distance according to position on the >> sensor, it can simulate out-of-focus, but it can't _simulate_ in-focus > > No. The two technologies aren't as disparate as a kangaroo pouch and an egg. > A better analogy would be driving two different routes -- one scenic and one > fast -- to get to the same place. Or traveling to the same place by car > rather than bicycle -- one being more pure, the other more efficient. > > Yes, it's true you can't bring objects into focus with PhotoShop – at least > not to any great extent. But using tilt for DOF is really only a factor in > large format photography, where DOF is extremely limited. With a 16 x 24 > sensor, extensive DOF is easy to achieve. Tilt would be relatively useless in > this case, except perhaps for macro photograph. And even in that case, the > entire camera can usually be tilted to achieve matching focus. > > There's a reason why no one is producing new tilt/shift lenses for DSLR > cameras. > > Paul
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