5D Mark 3 auto focus problem.

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I probably shudl post my question on lens section but i cant find the section anywhere.

Here is the thing , I bought a used 24-70 2.8L USM online, tne seller claimed that he tested the functionality and no problem upon mailing the lens.

However I run into some issuses.

1)When I use AF, the lens is consistently focusing in front and back without actually taking the picture.Pictures shot by MF is normal and working normally.
2) The eyecup vision is extremely dark through the lens.I can barely see the object through the eyecup.

I tried with different lens(24-105mm) but non of the problem occurred(Using exact camera setting). Since i am a beginner , is this issue about my camear, or i should try to fix the lens. How can i reslove those two problems.

[Waddizzle]

"I agree with Robert, the refurb section of Canon USA is excellent.  It doesn't offer the steep discounts available through some of the auction sites but instead of coming with the risk of a misrepresented and malfunctioning product it is a properly checked out product with a warranty."

The Refurbished store does offer some pretty good discounts from time to time, most especially around the winter holiday season.

[w15938713330]

Can’t wait !!