Gear Talk > Lenses

Canon 24-70 2.8L MKI to tide me over

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Razor2012:
I just picked up a used (I'm saying used because the guy that brought it in on consignment said new but I'm doubtful) 24-70 2.8L MKI.  This will tide me over until the MKII comes out.  I was also debating on whether to get the 16-35 II, but went the other route because I might get a UW prime once the 24-70II is in.  I have 7 days to return it, so I have to make sure it's ok.  Glass is pristine and body looks almost new.  Tried the focusing and it was fast and snappy.  Zoom seemed ok too.  Anything else you guys would suggest other than taking a bunch of shots and checking them over?

wickidwombat:
check if the images are sharp if they are you probably got a good one

Random Orbits:
Compare shots wide open from live view with traditional AF to see if they show comparable sharpness.  If not, microadjust and repeat.  Take shots of something flat and uniform in color/pattern to confirm that the elements aren't decentered (corners should show same relative sharpness and vignetting).

Mt Spokane Photography:
I've never found a used one to be what i'd call excellent.  Sellers often don't understand why they did not like it, but there is a reason.
The biggest issue with the 24-70mm L is lens decentering, all of the internal lens elements centered properly.  You can google on how to check for this, its obvious once you know what to look for.
Then I'd use FoCal Pro to run their battery of not only AFMA, but the other tests as well.
Some things you cannot fix, like the curvature of field that means the center and edges cannot be in focus at the same time.  Stopping down will hide it in depth of field, but some buy a f/2.8 lens actually expecting to use it at f/2.8.

Razor2012:
Thanks guys, looks good so far.  The images aren't quite as sharp as my 70-200II (spoiled now) but nonetheless excellent.  That 16-35II was nice though, as a person could get used to that 16 degree FOV.

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