daleg Offline Upload & Sell: Off
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answers - from my limited experiences:
dust - I've kept a b+w uv since day 1 on my used 17-40. I've never had an issue with my images. the filter's probably a good idea.
flare - I recently used this lens, mounted on a 60D (using articulating LCD), propped on a bean bag w/cable release, to shoot a fountains and fireworks show at a large, public, horticultural gardens (without the salad bowl shaped oem hood - which may have interfered with setting the direction of the lens - due to it's exaggerated shape). I may have had 2 images with peripheral octagonal shaped ghost/flare images. Both were cropped in post production. Thus, in conditions that favor lens flare, I was very happy with the images produced.
hood - I'm not a big fan of attaching a salad bowl to the end of a lens. maybe one could velcro stuffed animals to it to amuse kids (large and small). otherwise, it just makes storing the lens more difficult re: its odd shape.
other - one day I took this to an event I was shooting - and the auto focus (AF) simply didn't. It sounded like a meat grinder. It searched forever, and never focused. It had been gently handled and had suffered no impact or other trauma (to my knowledge). $175 (net of cps gold discount) and a trip to canon for repairs, and it's good as new - but caution: the AF mechanism can break - in my case, god knows why/how.
otherwise, it's a decent lens on an APS-C body.
just my experience, ymmv. good luck.
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