AF vs. AF-S - pros and cons

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hagani

Senior Member
I know that D7100 has a focus motor built in the body. I know that AF lens will work on D7100.

I have 18-55 and 55-200 both of them have their own focus motor.

Question for those who has both - AF and AF-S - when you using AF vs AF-S is there any difference or it works seamlessly and no difference?

In short - I am considering buyin AF 70-300mm and just want to get a feel from those who has this type of lens.

Thanks in advance.
 
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Geoffc

Senior Member
It works the same except AFS may be bit faster and quieter. The more significant point is don't get the 70-300 AF as it's pretty rubbish. Get the VR version which is a nice lens.


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aroy

Senior Member
Geoffc said:
It works the same except AFS may be bit faster and quieter. The more significant point is don't get the 70-300 AF as it's pretty rubbish. Get the VR version which is a nice lens.


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I have the AF version and it is very bad - lots of CA, and soft at the long end.

Regarding AF vs AF-S. For the AF lenses, speed mostly depends on the body, so in some cases the AF may be much faster, where as AF-S has constant speed irrespective of the body.

Another thing to check is the optical performance. In most of the cases AF-S versions have better optical performance compared to older versions. One exception that I know of is the 50mm F1.8. The AF/AFD versions have lower distortion and CA, but AF-S is a tad sharper.
 
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