Hey guys. Over the weekend, I took a lot of shots of the extended family, and the only shots that are really lackluster are the portraits. I'm not sure if it's the lens, but when i shoot portraits at the wide end of the 17-55 2.8, I'm getting horribly unsharp pictures. I'm usually shooting at f/5.6 or smaller, shutter speed around 1/100. I'm using a speedlite 580II in ETTL mode. The room isn't all that bright, with only two or three lamps. The ISO is usually at 400. Could that be causing the lack of sharpness? I also mounted on a tripod and forgot to turn IS off.


The lens is sharp in most other cases, and I've never noticed a problem in any other shots. Even shots i've taken in really low light and slower shutter speeds are sharper. I've used zone AF and single point AF, and spot and evaluative metering, and nothing produces any area of sharpness. My main concern is that none of the shots with my other lenses (50mm 1.8 and 85mm 1.8) had any problems when shooting the same portrait.


This is a 100% crop of the zone AF area.. Shot at 18mm, f/6.3, 1/80s. ISO 400. Is the low-light while composing the problem?


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