Chris T wrote:
Update: 6 of my two dozen lenses are Sigma glass. That's one quarter. But, when you add it all up, there are more Sigma optics in my collection than any other brand. In addition, the lenses I use on both of my MOST USED Nikon DSLRs - are both Sigmas ... ditto, for my most used Sony alpha. I'm not implying that's a commendation of all Sigma glass, far from it ... but, it is a valued opinion from a Sigma user. The important thing, R - is to assess your needs (which you've already done, quite well) and then to make your decision based on your OWN good judgment. If you find you can rent one for a week, before buying it - do that. Or, buy it, and invoke your 30-day no hassle returns warranty, if it does not suit you, or - fit the bill, adequately. You'd be hard pressed, though - to find another lens, which fits your needs, so exactly .....
Update: 6 of my two dozen lenses are Sigma glass. ... (
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The fact that you have 6 lenses none of which meet the Vote - Yes / No on the 50 - 500 criteria the OP asked for, makes all the verbiage useless. You saying the others are sharp is only talk that you never back up with images. You can talk the talk, but can you walk the walk?