Wildlife/Sports/Airshow Lens
- By RBS
- Canon Lenses
- 9 Replies
I have an EF 400 F2.8 IS II and it does play well with the 2X converter however adding a converter NEVER improves the optical performance so although you will like the results with the 2X because they are still sharp and high contrast be prepared to be somewhat disappointed when comparing the 2X teleconverter images to the results with the bare lens.
I have three of the Canon telephoto primes (200 F2 and 300 and 400 F2.8) and the bare results are incredible, the 1.4X results are really, really good, but the 2X takes away some of the "great white prime" magic HOWEVER a 400 F2.8 with 2X still produces better results than a multitude of lesser lens because the base lens is so incredibly good. The disappointment only comes when you do an A to B comparison of the bare lens to the converter version.
Also make sure that you very carefully dial in the microfocus adjustment with your camera body when you get into this focal length range because the decreased DoF leaves little margin for error. A 400 F2.8 plus 2X (and the same is true for the 300 F2.8 combo) is extremely good when perfectly focused and there is no motion blur from the camera or subject but if you miss the perfect setup you will have a disappointing image. Take some time with whatever setup you settle on because your initial results won't be your best as you learn the new setup so don't grow discouraged early.
And on edit, attached are a couple of photos shot this afternoon while I was adjusting the EF 400 F2.8 IS II and 2X converter to my EOS 1DX III because I hadn't fully dialed in that combo earlier. Shot at F5.6, 1/1600 handheld with IS off.


I have three of the Canon telephoto primes (200 F2 and 300 and 400 F2.8) and the bare results are incredible, the 1.4X results are really, really good, but the 2X takes away some of the "great white prime" magic HOWEVER a 400 F2.8 with 2X still produces better results than a multitude of lesser lens because the base lens is so incredibly good. The disappointment only comes when you do an A to B comparison of the bare lens to the converter version.
Also make sure that you very carefully dial in the microfocus adjustment with your camera body when you get into this focal length range because the decreased DoF leaves little margin for error. A 400 F2.8 plus 2X (and the same is true for the 300 F2.8 combo) is extremely good when perfectly focused and there is no motion blur from the camera or subject but if you miss the perfect setup you will have a disappointing image. Take some time with whatever setup you settle on because your initial results won't be your best as you learn the new setup so don't grow discouraged early.
And on edit, attached are a couple of photos shot this afternoon while I was adjusting the EF 400 F2.8 IS II and 2X converter to my EOS 1DX III because I hadn't fully dialed in that combo earlier. Shot at F5.6, 1/1600 handheld with IS off.


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