Tamron (28-300) vs. (18-270) zoom

[MYPOV]

The newer lens the 18-270 is for cropped sensor cameras only as I understand it.

My 28-300 is currently on it's way to the most local Tamron Authorized repair center to be rechipped. Apparantly the earlier production models of this lens..purchased in Augst of 08 had a funky chip problem that caused a lack of communication with the camera early on in the lenses lifespan. My lens lasted for about two months before the chip went wacky.