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Everyone vents from time to time, it's perfectly normal. Hell, glad you guys didn't here my vents about Canon. I presume OS means operational speed?
I note in the original post by Chris, he's made comparison to a Canon 100-400, which I presume is the L variant. That's a lens cost 3-4 times the amount of money, it's a pro grade lens. I haven't used one, but it has a good rep. Not a fair comparison Chris.
Can you please specfically state what you're not happy with, and post an example image so we can see and help you?
Dave
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