On an NEX camera those lenses couldn't be much smaller. Wide angle lenses already get as close as possible to the mirror on SLR cameras. Look at the size of the Olympus 7-14mm F4 4/3s lens (same coverage as the 14-24mm, although f4), it weighs 789g, 11cm long, 8.6cm deep. I'll compare it to the 16-35mm F4, simply because they have similar specs in terms of aperture. It weighs 680g, 12.5cm long x 8.2cm deep, again not much difference in size and weight, despite the image circle size difference, and that is 4/3s vs FX!
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