I had some reservations about this lens after reading about possible control knob conflict with the camera body but these proved unfounded for the Nikon camera I'm using it with. You can also correct the perspective distortion that wide angle lense can otherwise really exaggerate when shooting architectural or other geometric subjects. When you combine the 2 movement functions you can create extensive depth of field where you otherwise would have to resort to focus-stacking. Depending on the scene you are shooting, you can increase or decrease depth of field not just by the aperture setting but also by the tilt position relative to the camera and the scene you're imaging. When you alter the focal plane by tilting, you very quickly generate out of focus areas, that's how it's supposed to work. When used on a full frame camera, sharpness, even wide open, is pretty good out to the corners when the lens is not shifted or tilted. Optical performance is decent and meets my expectations. This lens allows me a lot of creative control in a variety of situations i could not otherwise accomplish with a wide angle lens. Perspective distortion creation or correction, focus plane shifting and control, this is a very versatile optical tool. This lens is great for expanding your creative abilities in ways you can't easily accomplish with software. The super close-focus ability extends the usefulness to small scale subjects. With independently rotatable tilt and shift axes, very similar to the Canon version, you are able to arrange a wide variety of optical adjustments with this lens. Build quality is decent but not like the heavy metal masters from Canon or Nikon. Already an economical alternative to the big name mfrs, getting this lens during a really good sale made it hard to pass up.
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