Reviews and Problems with Sigma 15-30mm F3.5-4.5 EX DG ASPHERICAL
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Lens has nice weight to it
Ryan Filgas, Amazon
27 November 2015
Summary: Lens has nice weight to it, but the focus ring is made of cheap materials and had wear marks on it straight out of a new box. This lens has terrible distortion at the corners. I used it for an outside shot of a tree at 15mm f/8 and the corners are so stretched there isn't any detail.
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.
Sigma 15-30 f/3.5-4.5: Fine lens but not without flaws
Marshal Shlafer, Amazon
16 May 2014
Summary: I purchased this lens (used, like new condition) to take on a trip as something much wider than my Nikkor 28-300mm zoom, since I had to travel light. In my search for an almost ultra-wide zoom, there were slim pickings at a price point I could currently afford, especially a lens compatible with an...
Summary: The lens is a great performer for sharpness on my Nikon D600 but that's about it. For the range its unnecessarily large. It feels cheap too. The weight of my Nikon Nikkor 28mm (small) feels better than this. The AF/MF ring idea is neat, but useless. The flare is unbelievable.
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: i got my copy used off of craiglist for $160. the lens had been well-used, like a divorcee with excess alimony. still, she was clean, with no scratches or dust, and she had a gleam in her eye -- or was that flare? anyway, this lens has already paid for itself a few times. its really wide on FX.
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.