bought a Sigma 100-400

Started 10 months ago | Discussions thread
ANAYV Forum Pro • Posts: 23,253
Re: bought a Sigma 100-400

Davidsy wrote:

Check the focus shift of that copy (I'm yet to find a sigma lense without it).

I don't think there are specific issues with this lense that are unique to it and that other sigma lenses don't have.

For casual use (what I understand as casual at least) everything else won't matter. If you use it for action photography, I would also check the speed of the AF drive. The sigma lenses I've use are rather slow, and I always got issues with fast moving subjects coming towards me. I don't know this lense specifically, but even the 120-300 gave me slow af. Having an idea of the limit of the lense allows you to know when you have to stop using tracking and start prefocusing (not to mention that to subjects more or less parallel to you the lense will do just fine).

Regarding the dock, there are some interesting things that you can do, but I don't know if is worth the money first hand. I've found them second hand some times very cheap, if so then yes, at the very least for firmware updates. And if you are interested, it helps to profile and correct front/back focus (although I won't consider that a concern of casual users).

No need to do this for Mirrorless. AF is obtained from the sensor, not from a separate, calibrated AF sensor. No need to AF fine tune lenses , either.

This is why I haven't bought the dock yet. Really good results so far.

ANAYV

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