I was looking for a small solution for landscapes and walks. I've avoided GM zooms for cost and weight reasons, but it's a great balance of features and would make a good 35mm lens for the a7000 if they ever come out with one. (Update) I also did it on my first trip with 16-35 and found that apart from some very wide shots, 24mm is fine for most landscapes I've shot. Even more impressed with this lens after a long time of use. Adjusting the aperture manually takes a bit of getting used to and occasionally gets misadjusted by mistake, but it takes some getting used to and works well.
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