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:
Nikon knows what photographers want. They design their optics from the photographers' point of view. The best way to a low light situation is a fast lens instead of pulling up the ISO. Only seasoned and knowledgable old hands will give these valuable tips away so that others will benefit.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.
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.
I'd take the Nikkor, tested it when it landed in sg, very cool, able to shoot at 1/8 F5.6 with VR, no handshake. Optics quality wise I'm fine with it. If can still see details after zooming 400% on the LCD screen I'm happy with it liao (me not fussy ). Would buy it if it's my first lens purchase with a dslr.kevyan said: