During use for documentary work this is a lens that can cope with just about any operating conditions. I also never feel I have to treat the lens with kid-gloves thanks to its durability.
The rear element does sit flush with the mount when the zoom is set to 17 mm so requiring extreme caution when mounting and dismounting from the body.
During use in wet, dusty or dirty conditions I'll keep checking the front filter and cleaning it as required while I'm on the go. The fact that I've got a UV filter on the front of the lens means I've got no worries about damaging it during frequent cleaning.
When I'm using the lens for documentary shooting I'll typically start off with it set to f/5.6 as this aperture represents the best combination of speed and image quality. Depending on the light levels I'll adjust ISO to allow me workable shutter speeds at f/5.6 and then only if I want to get specific control over depth of field or shutter speed will I change the aperture away from this setting.
I generally keep the lens hood on all my lenses during use. The greatest benefit of this is to provide an additional first line of defense against me knocking the lens and damaging it - all to easy when my concentration's on the subject, especially given the close focussing that often results in me getting too close and hitting the hood off something.
The focus is extremely fast and quiet. Focus can be shifted from closest focus to infinity extremely fast and accurately and I've had no problems with back focussing.
Considering that this lens is my widest option I have at times wished for greater range at the wide end but usually manage to get what I'm after by moving back, of course sometimes this isn't possible or not desirable for compositional reasons - at these times I do regret not being able to zoom out further.
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