« on: Today at 12:57:59 PM »
Looking at the crops compared to the tamron. They both look about the same at 400 f/5.6 the canon looks better in the corners at 560 than the tamron does at 600. If I didn't already have the tamron then I would get the canon.
Maybe you should wait for the Sigma 150-600 C version. With more LD lens elements it should outperform the Tamron but would be roughly the same weight and price.
It should be very good in the 400-600 range. We shall see - this time next year!!