D. Vance wrote in post #15460468
Aluminyzed metal prints?

Yeah, nothing's worse than not being able to get parts. Such is the case with the 28-70L, though it has sadly been discontinued long ago.

I've placed a number of orders with canon parts division before, but this is the first time I've been denied a part for a current product in the lineup. Really disappointing. The problem may not crop up with current bodies and lenses, but the CP-E4 is listed under the EOS-line of products, and isn't classified as an accessory in their system.
Regarding the 28-70L, they only provide repair support for 5-years beyond discontinuation, and parts are first come first serve as soon as the manufacturing line stops (assuming the part isn't shared with other products). Holding onto discontinued items is a risky venture, but the 28-70L is a TANK, and isn't likely to fail on its own. Even if the motor went (which should be the first/only thing to go), it's not of the old electronic focus variety--so it's still useful for manual shooting.
Plus a busted 28-70L is still worth a mint on ebay (up to 60%-75% of working value)--shops out there are looking to buy spare parts for these old beauties.
mikeinctown wrote in post #15460624
I almost bought one by accident while looking for a 24-70. Good to know that parts are no longer available.
Doesn't mean you shouldn't consider the 28-70L at a discount. There's no reason one shouldn't be fully functional for another good 20+ years. Even if it failed, you'd probably only lose about the same amount if you sold it versus a current (canon repairable) comparable lens (ie the 24-70L)