Do you mean in the sense of "my lens is a good copy"? Well, all manufactured lenses are a copy of a design original. they're basically saying their specific lens is sharp.
Do you mean in the sense of "my lens is a good copy"? Well, all manufactured lenses are a copy of a design original. they're basically saying their specific lens is sharp.
We use this word to say that different copies of the same lens may not be the same, i.e. not all the same lenses will perform similarly, there is some variability and some issue with quality control.
just remember this when you are selling lenses "I have a sharp copy ...."