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Studio Tests (Full frame, with 1.4x Extender in place)

Snap the lens's built-in Extender into place, and the test results are still hugely impressive. Sharpness drops slightly, but not so much that you're likely to really notice, vignetting becomes a bit stronger, and a little pincushion distortion creeps into the image. But this is all basically nit-picking.

Sharpness Sharpness is still very high right across the frame at all focal lengths, and only marginally reduced by the addition of the converter.
Chromatic Aberration Chromatic aberration is slightly increased, and there's a little cyan/magenta fringing at the long end of the zoom.
Vignetting Vignetting is slightly higher with the extender in place, with the falloff pattern intruding further towards the centre of the frame. But at only 1.3 stops in the corner, it's not going to be a huge problem.
Distortion There's visible pincushion distortion at all focal lengths with the extender in place. But it's not especially strong and unlikely to have much of a visual impact on real-world images.
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Canon EF 200-400mm f/4L IS USM Extender 1.4x

Comments

Total comments: 7
manolo romero
By manolo romero (1 month ago)

I just recently bought the lens and I'm very happy with the quality.
Its lighter than 400 2.8 sharpness is excellent. The ability to track subjects from a distance as you zoom are superb. That missing range from 200 to 400
is wonderful to have at a twist of a barrel. I can olny think of the shots Ive missed grabbing my 70-200. The ability to frame shots alone are worth a bundle. I let some fellow phtographers try the lens out while shooting a college Lacrosse match and they were equally pleased. The 1.4 ext. also gives you that range that would take an addition lens to cover, especially when shooting with a 1D IV. This lens has become my favorite sports lens in my arsenal.

0 upvotes
Dr Bhaskar Maitra
By Dr Bhaskar Maitra (3 months ago)

Very expensive. Out of bounds for 99% of photographers. Canon should reduce its price to realistic levels for increased sales. Only then, it can make a good profit margin. Very poor value for money.
Waiting for a head-on comparison with others....

0 upvotes
MarshallG
By MarshallG (6 months ago)

I would love to see Canon do this with their 200mm f/2.8 L lens -- a compact, sharp lens that 200mm f/2.8 or 400mm f/5.6. That would be fantastic.

4 upvotes
Scorpius1
By Scorpius1 (7 months ago)

Amazing lens,all we need now from canon is a top knotch sensor,and maybe they can knock a few hundred grams from the weight of the 1DX successor while they at it..

0 upvotes
Maciejewski
By Maciejewski (8 months ago)

Wonder if they need testers for this lens. I'm available!!!

0 upvotes
Francis Carver
By Francis Carver (8 months ago)

Lens weighs 8 pounds or close to 4 kilos according to the specs. R U sure you're in shape for it? Maybe it will come with its on 2-wheel dolly?

0 upvotes
Scorpius1
By Scorpius1 (7 months ago)

This is pretty light compared to the 400mm 2,8 mk1...

0 upvotes
Total comments: 7