also back in the day when purchasing one of my other lenses, I compared a sigma to a canon, and the optics were pretty comparable. However, it took so long for the sigma to focus on the suject in comparison to the canon that I put down the extra 6-700$ knowing that I was paying for the better image stabilization and auto-focus technology.
would I have been happy with the Sigma? Likely, but would I also have missed some amazing shots with it? most definitely, and to me, that's what makes the extra money worth it.
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