billnikon wrote:
I use Nikon with my Nikon, I use Sony with my Sony, and I have used Canon with my Canon.
Why do you ask?
These lenses were made specifically for my camera. Third party glass are produced to fit many many many camera's. I believe quality standards and better tolerances are available with OEM glass. It will also be worth more when you go to sell, third party glass looses much more value than OEM glass. Fact
The main reason for third party glass is that they are cheaper than OEM glass.
That may be a rule to live by, but there are exceptions. When I did the research, I found that the Sigma 24-70 f2.8 for Sony was every bit as good on all levels as the Sony"G Master" f2.8 that cost $1,000.00 more. This lens has given me the most usage, and best quality images over the past two years than any other lens I own. I had the firmware updated by Sigma at WPPI after Sony came out with the A7IV. There is no question that some third party lenses are as good or better than OEM. To deny this is foolish.