Consider to replace Sigma 10-20mm F4-5.6 to NIKON 12-24mm F4. is it an upgrade ?

Started Oct 6, 2012 | Questions thread
Lemi
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Re: Consider to replace Sigma 10-20mm F4-5.6 to NIKON 12-24mm F4. is it an upgrade ?
In reply to brianjb, Oct 8, 2012

Nikon 12-24mm has internal focusing and zooming so it doesn't extend or retract. It always stays the same length so there is much less chance to suck in dust and as it was said before it's extremely sharp in the center and excellent in the corners. I wish it were 2 mm wider but considering factors explayned above I'd never replace it with any other wide focal length lens.

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