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This update improves the following issues:When you use flashes, there is a delay from the time the shutter button is pressed to the time the shutter and the flash release.Applicable camera models: Alpha 7, Alpha 7 II, Alpha 7R, Alpha 7R II, Alpha 7S, Alpha 7S II, Alpha 5000, Alpha 5100, Alpha 6000, Alpha 6300, Alpha 6500, NEX-3N, NEX-5R, NEX-5T, NEX-7, NEX-F3, NEX-6
The Tamron 17-28mm f/2.8 Di III RXD delivers a quite convincing performance with just a few caveats. Considering its ultra-wide character, it's pretty sharp where it counts the most - the wider settings. The center quality is great and the borders/corners also on a comparatively high level between 17mm and 21mm. Many ultra-wide zoom lenses struggle a bit at their "long" end and the Tamron is no exception in this respect. While the results are good from f/5.6, the outer image field could be better at larger aperture settings here. The native distortion characteristic is very decent for such a lens and there's nothing to worry about with image auto-correction. The vignetting figures are roughly in line with other lenses in this class. Reads: there's some hefty vignetting at f/2.8 in RAW images. Auto-correction eases this is a bit but, a bit surprisingly, Tamron chose a non-aggressive correction profile here so you may still be able to spot some light falloff depending on the shooting conditions. The bokeh has its pros and cons. Out-of-focus highlights are comparatively nicely rendered whereas the overall rendition can be a bit harsh.The build quality is very good relative to its price tag. And whether you like the somewhat plasticky body material or not is also a matter of taste. However, an indisputable advantage of this approach is the very low weight of just 420g - and we are talking about an f/2.8 lens here. Unlike its fast, in-house zoom mates, it doesn't extend when zooming which is always something that we book on the plus side. The "moisture-resistant construction" seems to be somewhat inferior to other manufacturers - namely, there's no word about dust protection. However, we are talking in the context of a consumer-grade lens here. We quite liked the RXD AF motor on the 28-75mm f/2.8 but on the 17-28mm f/2.8, it's a bit on the slow side. This is usually no deal-breaker in this class though.Overall, the Tamron 17-28mm f/2.8 Di III RXD is a solid performer. It doesn't excel in any criteria but it does the job and, possibly more important than that, it does so for a reasonable price.
