I purchased this lens a few months ago and it is amazing. I slapped this beast on my Canon 5D Mark III and it is now my go-to. The image quality is astonishing. I did a ton of research on wide angle glass for over a year before going for this. I was considering the Canon 24mm TS II, but I couldn't justify it considering I already have a 24-105L. The 24mm TS II is much better in terms of image quality, but it isn't wide enough. I noticed a difference in quality with the first photo I took using this lens. There is some distortion, so it's not particularly great for architectural work, but it's fantastic for landscape work. This is the smartest purchase I've made since getting the Mark III.

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Tone and rendition
Sharpness
Built quality
Light weight
manual aperture
manual focusing

some flare in exstreme situations

A wonderful Wide angle on a full frame camera like canon 5Dmk2 or nikon D3x.

Very handy, good handling, Excellent performance in real life situations, Forgiving DOF for walkabout photos. A first choise for interior photos.

Outperforms the very heavy and clumsy but opticallly excellent nikon 14-24 on a D3x in a comparative test(at f8, else it was mor or less a draw).

To get something better you have to enter the medium format using an Alpa camera and Rodenstock wide angles with a Phase one or other good digital back. Or possibly a Leica with Zeiss or Leica lenses.

Customer Service

Very good

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