Overall
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Overall

As a photographic lens, a 50-100mm lens might seem a little odd: It doesn't reach as far as the 70-200mm you might be familiar with, nor as wide as a 24-70mm (or even an old-school 35-70mm, for that matter). The constant F1.7 maximum aperture means you essentially have a set of 50-100mm fast primes for portraiture, for instance, but it doesn't really offer much in the way of flexibility. The absence of image stabilization means you don't get the 'Dual IS' performance boost from combining in-lens and in-body stabilization.

Where the 25-50mm really starts to make sense is for video, and specifically for videographers who want to be able to shoot something longer than their 10-25mm F1.7, while maintaining a familiar shooting experience. In that regard the continuously variable aperture ring, knurled grip surfaces and well-controlled focus breathing make a lot of sense. It's hard to imagine it being used on its own, but as a way to extend the 10-25mm F1.7 experience over an even broader range of focal lengths, it seems obvious.