Reviews and Problems with Sigma 15-30mm F3.5-4.5 EX DG ASPHERICAL
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Book Reader "bob_spez", Amazon
12 August 2015
Summary: I think 15mm is the ideal ultra wide because with a FF outdoors it needed no lens correction in post processing, and indoors, at close quarters with a DX sensor the lens correction was minimal to set the horizontal and vertical lines straight.
Summary: Nice lens for the price.. Been looking to get a 17mm-50mm lens for my 5d mark ii.. These seem to be really good for landscape photography... They are some nice lens to have in your procession only if you are going to use them greatly..
Conclusion: I am really quite impressed with this lens on my 5d. It is sharper than I expected with no decentering at all. Sharp to the edges with the exception of the extreme corners, but overall an excellent performer fo an UWA. It is large, but not too heavy. I find the focus plenty fast and accurate enough.
Pros: Sharp, accurate focus, nice color, well built.
Cons: Some vigeneting on full frame, but easily corrected. Need to watch for flare.
Summary: Even though this lens covers a full-frame, its zoom range is wide enough that it is useful even on a crop camera (60D) on which its EFL is 24-48 mm. With the type of shooting I do, I need a wide angle of 24mm or more, so I'm often using this lens at its widest setting of 15mm.
Conclusion: if you don't need wider than 15mm than this lens is a bargain. I used this lens for youears without any problems, only the AF was loud. Lens is much sharper than the Sigma 10-20DC lens, very good from f7.1 and the corners are sharp from f9-f11.
Conclusion: Optically, it performs better than I expected (I expected a lot less for the price). Not the absolute sharpest, but it's satisfying. On full-frame, it produces some really heavy vignetting.
Pros: Decently sharp, build quality, large yet light
Cons: Vignettes a LOT on FF, loud AF, strange two-touch mf system, bit on the slow side.