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Loswr
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takesome1 said:mitigates or eliminate? Of course a few clicks of the mouse correct distortion in LR.
The post-processing correction is usually capable of eliminating the distortion. Starting with a higher resolution image, and the corresponding need to downsample for most output, mitigates the consequences of eliminating that distortion, but doesn't necessarily eliminate them, depending on how much resolution you start with and how much you need to downsample. Consider the extreme example of defishing a fisheye image - the corners will be very soft. To a lesser extent, the same applies to the 17-40, where the corners aren't sharp to begin with, and distortion correction makes it worse.
takesome1 said:Someone could make the same argument that you really do not need the Tilt Shift with todays technology. LR can simulate much of what a TS can do.
Keystoning can be corrected in post. Like distortion correction, there's a loss of sharpness, and you also have a lower MP image meaning less downsampling, since correction of keystoning results in significant cropping. Doing that also requires that you plan ahead and frame very loosely, and you need a lens wide enough to allow that loose framing.
I don't know of any software that can replicate the effect of tilt to increase DoF (in effect, technically it's not). Tilt means you don't have to stop down to apertures where diffraction softens your image. I suppose you could focus stack, but with moving subjects (trees in a breeze, clouds in the sky) that's not really feasible. The use of tilt to increase apparent DoF is the main use of a TS lens in landscape photography, make the argument that the TS effects can be duplicated in post particularly weak in this case.
takesome1 said:I do not know about you but I would rather have fewer things to correct in PP no matter how rare or insignificant they are.
Given that my RAW converter (DxO) automatically and effectively corrects vignetting and distortion, with no action required on my part during the workflow, I don't find it to be onerous at all.
takesome1 said:It really is subjective, why spend thousands of dollars on this equipment if we are not looking at using it at its limits.
That statement is a strong argument against getting the 24mm f/1.4L for landscape use, since it's primary advantage is the f/1.4 aperture...something not generally needed in landscape shooting.
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