Cheese wrote:
Seeing as you have a 5D iv and the 150-600 S, is that the lens you would recommend instead of the C or the G2? Thanks.
I have the C not the S.
When I did my research (Google), there was some debate about whether the S was worth the penalty of weight and almost double the cost...went with the C. Consensus feedback had the S better at 600mm but otherwise was negligible.
100-400 (either I or II) will have better IQ and at F4 ... better versatility in lower light.
The Tamron G2 feedback suggests its better than the C and almost as good as the S at 600mm....but with a slight cost increase.
In general 100-400 F4L ii is the best choice in my opinion IF you have the cash.
If you are just shooting BIF or sports on sunny days the Sigma C is a great choice for the price.
70-200 on an extender is the cheapest option but much debate about flexibility, AF stop-loss, actual IQ etc. As some have noted, Regis has taken some spectacular pics which for me settled the debate about sharpness. AF, flexibility, camera body etc etc remain.
Net: If you want good IQ at 400mm for the lowest cost get the 2x iii extender(assumes you have already spent the big bucks on a 70-200 2.8). If you want extra reach, with guaranteed AF on all bodies, get the Sigma C or Tamron G2.
Biggest cost, best IQ and most reach, crack open the kids piggy banks and get the 100-400mm L ii and the 2x iii extender. It will work all the way to 800mm on center AF pt on your 5DmkIV but I cant comment on how fast the AF is. (My C is very fast on both my 70D and 5dMkiv. Shot football, BIF etc and it was excellent....and on the 70D its over 900mm equivalent!
If you want to break your back ...get the Sigma S :-)
....so much fun deciding....
Attached a photo. 150-600mm SigmaC, 70D, f6.3, 2000ISO, 1/1600 350mm equivalent, cropped about 40%.