I love fifty dollars! I have over 5 of them already. But this lens blew me away! I don't want to take it off the machine. And the longer you use it, the greater the desire to continue shooting with it. I have a Canon 5DMkII. After the purchase, a shift focus was revealed (correction from 0 at close range, to +8 at infinity). I completely solved this problem in 30 minutes using the Sigma USB Dock station. Now everything is always right. Definitely worth your money.
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