The Sony Cyber-shot DSC-S2100 digital camera is based around a 1/2.3"-type ... The Sony S2100's lens offers a 35mm-equivalent range from a rather tight 35mm wide angle to a moderate 105mm telephoto.

The Sony T900 offers equivalent focal lengths that range from a 35mm wide angle to a 140mm telephoto ... which functions by raising the camera's sensitivity (and along with it, the noise levels ...

0.07% at 24mm and -0.07% at 35mm. This would be totally amazing for an ultra-wide zoom on its own, so clearly there is a partnership here with the camera body. However it is done, the end result ...

Considering the cost of the f/2.8 GM version, it makes the 16-35mm f/4 look quite an attractive proposition. For more options have a look at our lens top lists which feature optics we've reviewed ...