Yes, some losses when correcting in software do happen. A skilled person doing image processing compensates, just like a skilled person using a tilt and shift lens with a film or digital camera compensates for the issues that arise when you tilt and shift the lens relative to the receiving medium.
Personally, I've never really seen much point to tilt and shift stuff with small formats like 35mm, or the even smaller derivative DSLR formats. A shift lens is at times useful when doing certain kinds of panoramas, but tilting and such to me is primarily a medium format (and larger) tool to manage the lack of DoF that larger formats have to deal with. Such stuff can be used with small format cameras, of course; I just don't think the improvement in results is really worth the time. (The expense is mostly irrelevant.) G On Dec 2, 2013, at 7:41 AM, Darren Addy <[email protected]> wrote: > Correct me if I'm wrong, but doesn't perspective distortion in > software comes at a price? Don't you end up with a trapezoidal image > shape than then must be cropped to rectangular? > > Another possible problem comes with the DOF and orientation of the > image plane. With a T/S you have more control over the actual plane of > focus. You can place the plane of focus on the front of the building, > and use the shift to get the entire building into the frame without > disturbing that. With the photoshop solution, you need to use DoF to > cover the entire building (the plane of focus is NOT vertical, it will > be parallel to the film plane, which is tilted). Software solutions > almost require you to use hyperfocal distance on your lens. > > Here is a good, balanced discussion of the subject: > http://www.arthurdomagala.com/blog/2013/04/perspective-correction-lens-vs-software-2/ > and another that addresses the Samyang and Canon TS-E along with > software correction. > http://www.frontallobbings.com/2011/02/tilt-shift-vs-software-geometry.html > > I agree with Bruce that, for most people, software is going to be the > preferred practical solution. Far fewer people are going to take the > time to actually learn the principles of using a TS lens and also take > the corresponding time to properly set up the shot with one. Much > quicker and easier to take a bunch of images with your usual setup and > spend the time later in post. -- 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.
