That was until very recently, in July earlier this year third-party lens manufacturer Sigma got the green light to release its 18-50mm f/2.8 DC DN C, and followed up with the more recent 10-18mm f ...

At 18mm, central sharpness is excellent from f/2.8 to f/8, very good at f/11 and f/16 and soft at f/22. The edges are very good at f/2.8 and f/4, excellent at f/5.6 and f/8, very good at f/11 ...

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