Question about Sigma 18-200mm f/3.5-6.3 for Nikon

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Focusing speed of sigma 18-200 OS HSM

How is the focusing speed of sigma 18-200 OS HSM lens on nikon D40

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Re: focusing speed of sigma 18-200 OS HSM

As with most nikons the brighter the faster the af will work 

Posted on Dec 13, 2008

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I have the sigma 70-300mmD i just bought for my nikon D40 and i am having trouble with the auto focus. it will not autofocus can anyone tell me what i am doing wrong and or where i can download the...

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If those lenses have a Nikon mount then they will fit on the D3000 and D3100. However, the D3000 and D3100 lack a focus motor. If the lens does not have the focus motor then you will not have the autofocus capability. Sigma calls their focus motor the HSM; if the lens does not specify HSM then they do not have the motor.

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Best Auto focus Tele For Nikon D40

hi ! iam too a D40 holder,u can opt for AF-s versions or HSM sigma,both of them autofocus on d40,can go for 18-200 AFs VR or if u need still longer end go for 70-300 but it is costly than the sigms 70-300APO DG HSM MACRO..,its a much better reviewed lens and dont forget the cost..anyway do some research before considering..good luck

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Nikon d40 wont autofocus

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You should be able to use any Nikon AF-S or Sigma HSM lens on your D40. If you want to be 100% sure, email or call Sigma from They are generally very helpful with such issues.

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Unfortunately, this lens is not supported by the D40 due to Nikon's unfortunate decision to leave out the autofocus motor from this camera.  This is why I tell folks not to waste their money on the D40 - access to the many, many, many lenses that Nikon has made over the years, many of which are available used for a substantial savings, is lost on this camera.  The only Nikon lenses that work are AF-S lenses, and some third party lenses that have their own internal motors.  I got a list of Sigma lenses that are compatible with the D40 for you:
The list of compatible Sigma lenses for the Nikon D40 as of the current date is as follows:
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  • 12-24mm F4.5-5.6
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  • 50-500mm F4-6.3 DG
  • APO 50-150mm F2.8 EX DC HSM
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  • 150mm F2.8 EX DG
  • 180mm F3.5 EX DG
  • 300mm EX DG
  • 500mm EX DG
  • 800mm f5.6 EX DG
from here:
Sorry for the bad news.  The cheaper thing at this point may be to sell the D40 and get a D80.  I personally have a D70S, but that is no longer made.  

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