Looking to upgrade my 650D myself since I need way better low light performance and I would like better IQ.

I am looking to buy the 16-35 f/2.8L II, 24-70 f/2.8L II, 70-200 f/2.8L II combined with the 5D3. I don't understand the principle of the converters though. Maybe someone can help me out there?

Quote Originally Posted by Joel Eade View Post
3. 70-200 f/2.8L II.....the version 3 converters (1.4X and 2.0X) work well here to get you 320mm and 400mm focal length respectively
Wouldn't buying the 2.0x, cover the whole range though? Meaning, is there a need to buy the 1.4x as well? The 2.0x combined with the 70-200 would give me a focal length of 140-400 if I'm thinking correctly?

If I would keep the 650D, which has a crop factor of 1.6, would my focal length be 1.6 x 140-400 = 224-640? Do the converters even work on crop DSLRs?

Cheers!
Marco