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Best Pentax lenses for wildlife shooting? All I've really got is the HD 55-300mm, which was all I could afford while in uni. Now I've got a job and want a nicer, more capable wildlife lens. The DA* 300mm f4 looks nice, but I'd like something with more reach than a 300, but I don't quite have the stomach to drop 5k for something like the sigma 500mm f4.5. Looking at the 150-450mm, and some other stuff, but not too familiar with how they perform in terms of IQ, AF, etc. Recs?