What should I expect for focusing time on a superzoom lens (a57)?

Started Jan 15, 2013 | Discussions thread
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hooraysimpsons New Member • Posts: 12
What should I expect for focusing time on a superzoom lens (a57)?

Hello,

I recently purchased a used sigma 18-250 (not the new macro one) for use on my slt-a57.  However, it focuses extremely slow (on the order of seconds) and sometimes not at all.  One of the reasons my wife wanted the a57 was for the high framerate especially when using the lcd screen.  So we want to maintain that functionality.  I found some reports online reporting problems with sigma lens and the autofocus system on the SLT cameras.  So we are returning the lens and trying to find another copy or different lens (including possibly the new macro version to reduce weight since it will primarily be a travel lens).

So my questions is how fast should I expect the superzoom lenses to focus?  Would it be significantly different from the 18-55 kit lens?

When I say superzoom lenses I mean ones like the Sony 18-250, sigma 18-250 and tamron 18-270.

Thanks

Sony SLT-A57
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