Regarding its weight of nearly 1kg the Zeiss ZA 24-70mm f/2.8 feels like a massive block of glass. However, this is not overly unusual - the Canon and Nikon counterparts are in the same weight- and size-league. Upon closer inspection you may be a bit surprised that the lens is not an all-metal construction. The inner tube as well as the lens hood are made of metal indeed but Sony used plastics for parts of the outer body. Plastics may sound bad but it is a high-quality variant ... although it does still not feel really right regarding the positioning of the lens. Unfortunately the lens does not feature any seals which is also a bit of a faux-pas. The zoom ring operates a bit stiff - surely a side-effect of the heavy weight of the glass. The handling of the focus ring is smoother. Typical for most Sony lenses both control rings have an inevitable tendency to collect dust in no time "thanks" to the fluted rubber design.
Looking at the product shots at photozone.de you may notice that the lens extends when zooming from 24mm towards the long end of the range. The Zeiss uses an internal focusing design so the front element does not rotate during focusing (nor zooming) operations.
One of the interesting features of the lens is the SSM - the SuperSonic AF Motor which is similar to Canon's USM or Nikon's SWM. The SSM is not really a new thing for Sony/Minolta users - Minolta released the first SSM lenses several years ago - but so far Sony was quite shy to take advantage of it for whatever reason. The SSM of the Zeiss is ultra-fast, near silent and very accurate. More of this please! Sony/Zeiss did also incorporate a focus-lock button plus a dedicated AF/MF switch.
Take a look at the Specifications, and read on here
http://www.photozone.de/Reviews/47-sony-alpha-aps-c/380-zeiss_za_2470_28?start=1
and see samples here
http://www.photozone.de/Reviews/47-sony-alpha-aps-c/380-zeiss_za_2470_28?start=2
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