21farms Offline Upload & Sell: Off
|
i've owned the 28-70L, 24-70L and the tamron 28-75. here's how the two you are thinking about compare in size:
http://www.pbase.com/norm/image/38969934/original.jpg
all are excellent lenses. when i first got the 24-70L (new), i was extremely disappointed at the misfocusing so while it was going back and forth to canon factory service, i picked up a 28-70L. oh man, what a lens...sharp, colorful, fast...i loved it. but, after canon finally got my 24-70L fixed right, i loved it even better. still, i needed something smaller and lighter and picked up the tamron on a lark. terrific lens and significantly more compact, especially with the hood. just a tad softer at the wide end and perhaps just a tad sharper at the long end in the middle...not enough to really notice i'd say. auto-focus is certainly faster on the canons and i noticed more keepers when shooting moving objects with the canons, probably because the AF can keep up better. if you want to pixel-peep, you can look here: http://www.pbase.com/norm/canon_v_tamron personally, if yours is "soft", i'd check for front or back focus and send it to tamron for calibration if necessary.
|