Sorry, but Im SO uneducated on lenses! Ive decided to get Tamrons 17-50mm f2.8 lens, and Ive found some great deals. My question is: Whats the difference between the
SP AF 17-50mm f2.8 XR Di II and the Tamron AF 17-50mm f2.8 XR Di II LD ZL? Anyone know what the ZL means? I can get a perfect one for less than $300, and the best I can find on the XR is $415. Thank you for the advice.