I'm looking for a new lens for my Minolta 330si. I go to a lot of auto races, so I want something that will focus pretty fast. I also like shooting wildlife, so quiet is good too. Obviously lens quality is important as well. The two lenses I was looking at are the Konica Minolta - 75-300 MZ D Autofocus Zoom Lens Lens: 75-300mm f/4.5-5.6 (D) (S) Lens Construction:13 Elements in 10 Groups Angle Of View: 32 - 8-degrees @ 10' Minimum Focus: 4.9 feet Max. Magnification: 1/4 Filter size: 55mm Dimensions: (diameter x length) 2-13/16 x 4-13/16 inches Weight: 16.25 ounces and Quantaray - Tech-10 70-300mm f/4.0-5.6 High Speed Auto Focus Zoom Focal Length: 70-300mm Focus Type: Auto Aperture Type: Automatic / Variable Aperture Range: F4 - 22 (70mm) F5.6 - 32 (300mm) Optical Construction: 14 Elements in 10 Groups Minimum Focus: 58.5" (37" in Macro at 300mm) Macro: Yes (1:2) Filter Size: 62mm Size/Weight: 4.7"x2.9" / 20.6oz Going on the theory that a non-minolta lens should be chaper for the same product, and these are about the same price, is the Quantaray better? I realize tht it's heavier but that's not too improtant to me. The slightly better macro won't be too useful for my applications. Any thoughts?