Just got this lens refurbished. Some shots, like the cat below, look pretty sharp. Others, do not. So I'm wondering if it's the lens or if it's just me. I'm wondering if the autofocus is faulty. Don't have any previous experience with this lens, so any opinions would help. Thanks.


All shot on a rebel xsi.


f 2.8, 1/1600, 55mm, ISO 200


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.30.41/IMG_5F00_7618small.jpg[/img]





Maybe this is a light issue, but I couldn't get this sharp. Maybe the autofocus couldn't lock on?


f 6.3, 1/250, ISO 200


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.30.41/IMG_5F00_7732small.jpg[/img]





This one looks better, I think. I'm just not sure why some are really crisp and others are not.


f 2.8, 1/50, 55mm, ISO 800


[img]/cfs-file.ashx/__key/CommunityServer.Components.UserFiles/00.00.00.30.41/IMG_5F00_7756small.jpg[/img]