hey, I own EOS 5D MarkII and currently planning to get Tilt and Shift lens. The primary purpose for using it would be landscape photography, but of course, I would look forward to benefit from other opportunities provided by such lens. I do not know if it would suitable, but would be ideal if it would fit for close-up photography with perspective background. At the moment, I cannot decide which one to get - 17 mm f/4L or 24 mm f/3.5L. I've seen few post on this, which did not provided clear dominant opinion, thus I would appreciate if you would share your ideas and experiences, especially from the landscape photography point of view. Since I use full frame camera, I've heard an opinion that 17 mm. might appear too wide and 24 mm would suite in more situations. But isn't it so, that using 17 mm I would still get a chance to crop the image and get an 24 mm effect? I really do not mind paying bigger price for 17 mm., performance quality and usability is most important thing. What about optical performance of both lenses - are they both equally good? I understand that with 17 mm. I would not be able to use CirPol filters, which is disappointing. This would be possible with 24 mm. What about the DOF of those lenses? - I've read an opinion that with 17 mm. I would not be able to get shallow DOF with tilting the lens. Is it true? I would also appreciate if somebody would post some links with landscape pictures taken with 17 mm lens.