When the camera AF is adjusted by Canon there are 2 ways that they can do it:
1. mechanical adjustment of the AF sensor in the body.
2. software adjustment in the body.
Normally these would be done in that order, the software adjustment being like a fine tuning. Both of these adjustments will...
The Tamron SP series are quite old manual focus lenses which won't be very easy to use on your Canon 600D and personally I would advise against it.
The Sigma could be your best bet, but check with mpb to ensure that it is fully compatible with your camera model because some Sigma lenses do have...
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