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Guys, I'm owner of pic related and have the kit 18-55 lens and a Sigma 10-20. Both employ screw drive AF. I've been happy so far. However, today I was in a store and handled nikons entry-level d3300 with a kit lens and the AF speed and accuracy just blew me away. If I get a a lens for the Pentax that's not screw drive, like for example the 18-70 or the 18-135, will it perform similar to the nikon? Any Pentax fags with said lenses that can give some input?