Sony A55 + Sigma 17-50mm: Expected Behavior or Defective?

Started Jun 15, 2011 | Discussions thread
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Sony A55 + Sigma 17-50mm: Expected Behavior or Defective?
Jun 15, 2011

Just bought the Sigma 17-50mm lens as a replacement for the kit lens and while I am generally happy with its performance, have a few questions about its behavior in Auto modes.

1) In the Auto+ mode, the camera when equipped with the lens, switches to Macro mode and the macro icon shows up on the top left of the screen. In the same physical setting, the camera picks the correct mode with either the kit or the Sony 50mm f/1.4 lens! I generally never use this mode, but the wife does!

2) With the ISO set to Auto, in AperturePriority or ShutterPriority modes & under identical settings, I get lower ISO pictures with either the kit or the 50mm lens!

Would appreciate any thoughts on the matter. On the plus side, the focus is VERY quiet & the pictures from the lens are certainly sharper when compared to the kit lens; although no as sharp @ 50mm as the Sony f/1.4 50mm lens.

Thanks!

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