Always bear in mind that the smallest maximum aperture for AF to work properly is f/5.6 as specified by Nikon, so there is no guarantee that the AF will work properly in poor lighting situations when you're at the maximum zoom with these f/3.5-6.3 lenses. Which is also the reason why Nikon die die designed the lens to be at least f/5.6 at the 200mm end.kevyan said:Hi all, just want to find out, beside Nikon 18-200mm, which of these two will be your 2nd choice?
Tamron - AF 18-200mm F3.5-6.3 XR Di II
or
Sigma - 18-200mm F3.5-6.3 DC.
kevyan said:Hi all, just want to find out, beside Nikon 18-200mm, which of these two will be your 2nd choice?
Tamron - AF 18-200mm F3.5-6.3 XR Di II
or
Sigma - 18-200mm F3.5-6.3 DC.
lsisaxon said:Nikon die die designed the lens to be at least f/5.6 at the 200mm end.
Having said that, there is no reason why you cannot use the Tamron or the Sigma if you don't want to pay for the Nikon one now. But you may regret your decision later if the Tamron or Sigma does not live up to your expectation.
I would only make this statement if the manufacturer is Nikon.forward said:I was a victim for years and had to learn the hard way of having to empty my wallet to optics that could not match my expectations. The best bet will be the original optics from the manufacturer of your camera body.
zaxh81 said:bo liao poll
That would probably be because the aperture is already at f/6.3... smaller than the f/5.6 specified by Nikon for the AF to work properly.jeffhiew said:Have tried Tamron 18-200 b4, the focus is slow, it hunts.
Would bite the bullet and get Nikkor.
kevyan said:Hi all, just want to find out, beside Nikon 18-200mm, which of these two will be your 2nd choice?
Tamron - AF 18-200mm F3.5-6.3 XR Di II
or
Sigma - 18-200mm F3.5-6.3 DC.