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Sigma HSM /AF on Nikon DSLR

PostPosted: Thu Mar 20, 2008 5:05 pm
by idleowen
Hi,had a question on a newly purchased Sigma 10 - 20 lens,for my D80,hoping somebody might be able to offer some advice / assurance!
I'm used to the Nikon 18-200VR lens for focusing,when it correctly focuses on the subject(still object),repeated half presses of the shutter doesnt seem to prompt the motor to activate,indicating locked on focus.With the Sigma,on a still object,it emits a motor engagement noise as though its repeatedly trying to focus/refocus but the green viewfinder light stays green. Doesnt seem to shift the lens barrel to 'hunt',pictures are sharp.Just wondering if this is a Sigma HSM trait?
thks in advance!

Re: Sigma HSM /AF on Nikon DSLR

PostPosted: Tue Oct 21, 2008 6:16 pm
by ljxphotography
I used to have this lens, and cant recall having this problem.
I have a 100-300 f4 HSM lens currently and it only makes motor noise when trying to focus or shifting focus from one position to the next.

Mick :mrgreen:

Re: Sigma HSM /AF on Nikon DSLR

PostPosted: Tue Oct 21, 2008 8:51 pm
by aim54x
ljxphotography wrote:I used to have this lens, and cant recall having this problem.
I have a 100-300 f4 HSM lens currently and it only makes motor noise when trying to focus or shifting focus from one position to the next.

Mick :mrgreen:


I have the EX APO DG 180mm f/3.5 Macro, never noticed this problem, but I guess a macro is a very different story. My experience is much like ljxphotography, no noise if no shift in focus.

Re: Sigma HSM /AF on Nikon DSLR

PostPosted: Tue Oct 21, 2008 9:10 pm
by big pix
10-20mm will work different to 18-200mm,,.... you will not notice the small shift in focus as with a wide angle the shift in focus is quite small unless you move from something close to far away.........

Re: Sigma HSM /AF on Nikon DSLR

PostPosted: Tue Oct 21, 2008 9:43 pm
by Yi-P
Its a common issue with this lens, nothing to worry about. Mine had the same 'small focus hunting', you just get used to it over time.