My Canon 75-300mm has this problem.
Everythg is abit loose when im doing the Manual Focusing.
Seems like the barrel is also not smooth.
I enquired afew shops regarding repairs and some mentioned a particular screw and some even mentioned to change the barrel which i think its a bit scary!
I roughly wanna know who experience this problem and if you did some repair what is likely to be the issue and how much is the repair cost?
Thanks in advance to all!