[00silvergt]

Originally Posted by cyclohexane

What he's saying is that many camera companies outsource production/design of some of their lenses to other manufacturers, having their own badges applied to the products. This re-badging was/is incredibly common in Japan; Ed talks about it above.

Some of the lenses are pretty obvious once you compare optical formula diagrams. Some examples:

Nikon 70-300 f/4-5.6G (old model) = Tamron 70-300
Pentax 12-24 f/4 = Tokina 12-24 f/4
Pentax 10-17 fisheye = Tokina 10-17 fisheye
Konica Minolta/Sony 11-18 = Tamron 11-18
Konica Minolta 28-75 f/2.8 = Tamron 28-75 f/2.8
Olympus 70-300 = Sigma 70-300

Yes, but Canon boasts that they keep that stuff inside. None of those lenses are Canon. I was saying, maybe Noink and others did that, but Canon "suppose" to be doing their own design and manufacturing.