Quote Originally Posted by neuroanatomist


One way to test for AF issues is to use a printable focus test chart, like this one. You tape it to a door (so you can adjust it to a 45° angle to your camera), and mount your camera on a tripod at ~25x the focal length, the longest end of a zoom (so for your 70-200mm zoom, that's ~16 feet from the chart), and test at the widest aperture.



The 25x focal length was a bit too far and with my 6mp sensor ~300% crop was a bit out of the question [:P]


The directions said as close as possible so I shot these with 1ft distance for the Tamron and 5ft for the Canon. I think I can happily say I'm fairly lucky to have a well matched lens/camera set up for both []


...or is there anything here that you guys see??


These are not sharpened. PS unsharp masking filter made the letters mostly nice and crisp []





Tamron 17-50mm f/2.8 non-vc @50mm 1ft away


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Canon EF 70-200mm f/4L USM @200mm 5ft away


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.39.83/Canon-EF-70_2D00_200mm-_4000_200mm-5ft-away.jpg[/img]