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500mm vs 600mm?

Started Nov 13, 2017 | Questions thread
dgumshu
dgumshu Veteran Member • Posts: 4,623
Re: I'll complicate the matter a little...

BirdShooter7 wrote:

The two copies I had were good, the second better than the first. I was very pleased with the performance of the bare lens and with the 1.4x but I definitely saw a drop off in quality with the 2x that was more pronounced than what I see with my 300mm f/2.8, 400mm f/2.8, 500mm f/4 and 600mm f/4. This is not to suggest the mk2 400mm f/4 is not a great lens, I actually like it quite a bit. It does have some pretty stiff competition from the other big primes is all.

Actually, the 400 DO ll with 1.4 lll outperforms the 300 F2.8 with the same TC according to a lensrental test. Without the TC, they're pretty much neck and neck.

https://www.lensrentals.com/blog/2015/01/more-canon-400m-do-ii-comparisons/

I recall a good number of people on the FM forum selling off thier 300 F2.8s after the DO ll was released.  The 300mm is an excellent lens, though.

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