What do all those cryptic number and letter codes in a lens name mean?

I was looking at the Sigma 150-500mm f/5-6.3 DG OS HSM APO Autofocus lens yesterday online and got to thinking “what on earth do  all those codes mean?”

Being a Canon user, I had very little info on other brands codes. I did some searching and found this website with pretty much everything you need to know.

Enjoy.

What do all those cryptic number and letter codes in a lens name mean?

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