[QUOTE]\nIn message <br9bhc$iol$>,\n\n\n\nSense.\n\n1) You don't buy an 'L' lens just because of the optics.[/QUOTE]\n\nCertainly not when you use a DSLR with a blurry sensor.\n[QUOTE]\nThey are\nsealed better from moisture and dust; they manually focus smoothly\nwithout play.[/QUOTE]\n\nThat's worth 00. Why not buy 6 pro lenses instead?\n[QUOTE]\n2) Every lens varies in sharpness at different apertures, and different\nfocal lengths if it is a zoom. L lenses tend to have a larger\npercentage of their range sharp enough for the sensor.[/QUOTE]\n\nNot with a blurry sensor they don't.\n[QUOTE]\n3) Many L lenses can resolve far more than than current DSLR sensor can,\nbut their higher sharpness means more contrast in the highest\nfrequencies recorded, and less artifacts should you decide to boost the\nhigh-frequency contrast for final output.[/QUOTE]\n\nWith a blurry sensor? Irrelevant.\n[QUOTE]\n4) Many L lenses have almost 0 chromatic abberation. My 300mm f4L, for\nexample, has so little aberration that no focusing compensation is\nnecessary for IR.[/QUOTE]\n\nThat's because your 10D is completely blind to features less that 4 pixels\nwide.\n\nAnd you forget the main reason 10D owners buy L glass: It's a fashion\nstatement.