Tilt-Shift vs Software Geometry Correction
|The Canon TS-E 17mm F/4L.|
Complex design allows for several configurations
in multiple directions, and orientations.
|Big fat front element and|
2 lbs of lens. One heavy
One of the main things I shoot in photography is interiors, and many of my clients like to have perspective correction in their images. To do this, you can either use a tilt-shift lens, or to use software solutions found in software like DxO Optics or Adobe Photoshop/Lightroom. I was curious for some time, just how much of a benefit using a tilt-shift over software solutions. Aside from the major learning curve in using a tilt-shift lens properly, it does produces some spectacular results. If you want to learn a little more about how tilt-shift lenses work, this link and this other link to learn about controlling the depth of field.
|Parallel perpendicular lines with the Canon TS-E 17mm|
So why compare the 14mm against the 17mm tilt-shift? Well simply put, with 11 degrees of range of adjustment, is precisely the amount of difference between the angle of view between a 14mm and a 17mm (104° vs 93°). In theory, from the same shooting location the shot should look similar to each other when correction has been applied.
|Samyang 14mm with no correction|
|Samyang 14mm with Up/Down correction|
|Samyang 14mm with Up/Down and X/Y Ratio Correction|
|Where the Tilt-shift lens really shines is in deep depth of field landscape shooting. |
You need patience and need to check all corners of your image to ensure perfect focus.
Just wanted to add an additional point. The TS-E is very sharp, but very difficult to master. My opinion on getting one or not is strictly based on the concept of using this specifically for maximum DoF. This is more specific to the 135 format 5D and up bodies where you can use apertures of F/11 or more with marginal consequences. On a crop format, you can technically get deeper depth of field on a lower aperture because of the crop factor, however, diffractive limits do keep you from going too high at the cost of image quality. Of course crop cameras cannot shoot as wide as these shots with the same lens. The TS-E is sharper than the Samyang with software correction, but and there is a but. In the time it takes me to get the TS-E perfect, I can set-up my Samyang, shoot and move off to maybe half a dozen other shots before the TS-E is right. You have to be patient with it, and I do like the results of it, but the limitations of not seeing your entire image as you make corrections through-out is very annoying when I know that I can set my Samyang at even F/5.6 and everything will be in focus.
|MC TS-PC Harblei 45mm Super Rotator (requires an adapter)|