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Message: <blockquote data-quote="benhasajeep" data-source="post: 847126" data-attributes="member: 70649"><p>My first long lens was a Sigma 150-600 in F mount.  After about 9 month the AF went weird and actually sped up (their version of s drive, not screwdriver), but making noise.  So, I sent it in and it came back with AF about 1/2 the previous normal speed.  I complained to them and they said the lens was running too fast initially.  The glass is fine but there is no way to use it for items moving just too slow.   I got the 180-600 for ease in travel.  I have a Think Tank Airport Essentials travel bag and it fits in the center slots perfect (takes up almost the entire center).</p></blockquote><p></p>