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PostPosted: Fri Jan 04, 2008 2:53 pm 
Hi,
I'd this len for about 2 months and seldom use it as I'd the 18-200mm OS as my carry around len. Now the problem with my 50-150mm is that it can't autofocus at the focal length of 150mm where the len to the object ( let say the len cap ) is about 50cm. It can only be done when you start at a focal length of 50mm, autofocus, lock, zoom in, repeat this procedures till the focal length is at 150mm.
My question is why it can't autofocus immediately at 150mm ( the distance of the len to the object ) and why it needs to start at 50mm and then slowly zoom in before it can autofocus? Is there a problem with the len or is this normal? I don't have this problem with my 18-200.
Need advice from experts here.
Thanks


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PostPosted: Fri Jan 04, 2008 3:16 pm 
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Joined: Sun Nov 05, 2006 11:08 pm
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Location: Germany
The prob seems to be that the Sigma 50-150mm needs a minimum focus distance of 1m, that being about 80cm from the front-lens...

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses


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PostPosted: Sat Jan 05, 2008 8:42 am 
Hi Thomas,
Thanks for the information. So this is normal right? :D


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PostPosted: Sat Jan 05, 2008 10:58 am 
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Since this is not a lens designated as "macro": Yes, then this is normal.

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses


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PostPosted: Sun Jan 06, 2008 2:36 pm 
Hi Thomas,
Thanks once again :)


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