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I am striving for landscape photography with as portable a camera as possible (and no tripod if possible) that has full manual and creative controls. Any wide-angle lens (or lenses that have a wide angle range) you guys recommend?
Well, the obvious place to start are the kit lenses, as they are quite inexpensive. The 16mm has received very mixed comments. While some have posted nice pictures with it, others (I included) have found their copy(ies) to be totally disappointing.
The kit zoom (18-55) is not bad at all, considering. While you can't expect it to perform like a prime costing 10x as much, it can produce decent landscape shots.
But landscape shots do not require AF, so MF lenses are a totally viable option. While just about any MF lens with an aperture ring can be adapted on the NEX, it seems to me that only compact ones are in keeping with the NEX concept (others are free to feel otherwise). Therefore you can look at new lenses from Voigtländer, or, if you have more money, Zeiss, both in M (Leica) mount, or even, if money is no object, Leica lenses. But you can find much cheaper used MF lenses that work well. Browse through the countless NEX threads on this site to see for yourself.
As to focal length, be aware that an ultrawide can suffer from colour fringing on the NEX, so anything wider than a 25mm (equivalent to 37,5mm with the crop factor) should be handled with care, and software such as Cornerfix may be required to clean up the sides and corners.
Two more bits of advice. One is that, with MF lenses you will need an adapter; I have chosen not to go with the very cheap Chinese ones found on e-Bay, but rather to pay mor efor better quality, as bad adapters are a problem. Then, keep in mind that the NEX camera is easily "good enough" to let good glass show through, so do not hesitate to buy the best glass you can afford. The result will not be "camera limited"
Here is one example from my NEX with my Zeiss ZM Biogon C 35mm f:2.8.
NEX-5 ---- lens f/1.0 1/500s 200 ISO 0.0 EV