Hello all!
I've been considering the purchase of a long prime for some time now and I recently came across a used 500mm in excellent condition with a date code that puts it at February of 2000. My question is this: Are there any differences between a 500mm manufactured in 2000 and one manufactured now? For example, has the USM been updated or anything along those lines or are they exactly the same, except for the age factor?
If anyone has any insight on this, please educate me.
Thank you in advance for your time and efforts!



