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Title: sigma 300mm f 2.8
Review: I have bought a copy of this lens for a pentax k-20 and k-7. It is the worst lens i have in my collection. The international warrenty is completly useless. Do not travel and buy this lens. I have had it for three months and it is a good paper weight. I have tried to get international warrenty on the lens and no one in asia services the lens or does not have the equipment to work on it. The autofocus is so far out it is worthless. Sigma says send it in with camera at my own expense. What a rip off. The IQ is very poor for a lens like this.I suggest buying a paper weight for 5 dollars. And not a 3000 dollar one.
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