I want to upgrade from compact (Sony 24x superzoom) to more enthusiast-style camera.
After extensive search and comparison (dpreview.com and elsewhere) I have selected Sony SLT A55, Lumix GH2 and Nikon 5100 to be the best cameras for me. So I'm looking for lenses for Sony Alpha, Nikon F or Micro 4/3rds. The final decision about the camera depends on the lens that I can mount on them.
I travel a lot and I'm fascinated by nature, people and cities when traveling. I want to use the new camera with the lens to shoot those things.
I estimate I will shoot following types of shoots at this rates with the lens:
- Landscape: 30% (includes natural scenes, different kinds of human creations/architecture, travel mates on in different situations and environments).
- Wild life: 15%.
- Faster action: 15%. Not Olympics, but shots like birds, my travel-mates jumping over rock gaps, locals playing football, etc.
- Indoor/Low light (late evening): 15%.
- Portrait: 15%.
- Macro: 10%.
I don't want to play for photographic safari, so the lens should give good results in all six situations and should still be portable (under 650g).
I prefer faster auto focus so I can take picture in right moment and one after another. Especially when shooting wild life (#2), faster action (#3) or portrait (#5). It should not be too noisy and should provide some kind of image stabilization (not necessary if camera itself has good enough stabilization — if I remember it right only A55 is the case). Other than that, the only criteria is best photos quality given those six scenarios above.
I understand all the disadvantages of having single lenses for all these purposes. I'll definitely buy some lens to use when not traveling later. But for traveling I can only carry one lens with me. I'm technically skilled, I have some experience with DSLC and I understand the terms. Please, do not hesitate to suggest high-end solutions and be technical in your answer if you prefer.
If appropriate, please also comment my choice of cameras or suggest another one. My final goal is to achieve best photo quality in the six situation (above) in with equipment of travel-enabled size and weight (given the fact that I'll not carry tripod and I like fast AF).
EDIT: As the first scenario (Landscape) will do around 1/3 of all my photographic activity with this lens, I think that the one sure requirement for the lens is that the wide end should be 28mm equivalent to 35mm film (typically 18mm or 14mm for Micro 3/4).