Is my Sigma 18-125 lens bad?

Joined
Jun 23, 2005
Messages
68
Location
Netherlands
Hello People,

I own a Sigma 18-125 1:3.5-5.6 DC lens. I bought it instead of the kit lens with my D70 and use is as main walk around lens. Can you have a look at this picture (large JPG straight from the camera) and tell me if you notice something?

I have the impression that the left side of some this pictures is badly out of focus. It is a photo of a serie of test shots I made. It was shot using the wide side of the zoom (18mm) and large aperture (F3.5). With smaller apertures the effect seems to disappear rapidly. I can not reproduce this effect at longer focallengths or my other lens (Tamron 90 mm 1:2.8).

I made the testshots because I have similar photos where the left side is out of focus.

:confused: Is this normal behaviour normal? (I guess not)
:confused: Should I go back to my dealer? (If the behaviour is not normal, yes, of course)
 
Joined
May 8, 2005
Messages
4,638
Location
Orlando, FL
It looks that way, but I would choose another subject - e.g. a newspaper taped to a flat wall - for a more critical demonstration of the problem.
 
B

bpetterson

Guest
Your focus point as read in Nikon Capture was on the horizon
quite far away.
In any case at that distance try f8 to f11 and see if the problem goes away.

Birger
 
Joined
Jun 23, 2005
Messages
68
Location
Netherlands
jfrancis said:
It looks that way, but I would choose another subject - e.g. a newspaper taped to a flat wall - for a more critical demonstration of the problem.
John,

Thanks for the suggestion. I tried that and it showed that I have the problem with both lenses I own. I guess that means the sensor of my D70 is misaligned. I sent it in to the local representative of Nikon in Holland (Inca) :frown:. Three weeks later and it would have been outside the garanty period. Now I have to wait until it returns.
 
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