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Old Jan 23, 2013, 1:14 PM   #1
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Default Canon Teleconverter 1.4 III

Thanks for looking. Does any one know for sure if this converter works properly with the Canon 100-400mm L lens ?? I've read it does work, and
other individuals says it doesn't. Any info much appreciated.
Thanks,,,,,,,,,,,,,,Steve [email protected]
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Old Jan 23, 2013, 1:30 PM   #2
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It will physically fit. Whether or not the result will autofocus depends on what camera body you are using - since this makes the lens an f8 lens.
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Old Jan 24, 2013, 9:01 AM   #3
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As John pointed out if it works really depends on the body(s) you are using it with.

I have mates who have that lens and 1.4 TC, and discovered that combination will not work on their 5D mkii/iii's and 7D's. The consumer/prosumer bodies from Canon cannot autofocus at F/8, their limit is somewhere around f/6. They can be tricked by using a third party TC that does not report the true maximum F stop in use to the camera. However AF becomes a very slow hunt with those cheap TC's and they are also not very good optically, they tend to ruin an otherwise good lens performance.

The combination does work fine on a 1dx, (or any 1D series body that are OK with AF at F8.)
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Old Jan 25, 2013, 5:11 AM   #4
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Quote:
Originally Posted by PeterP View Post
... The combination does work fine on a 1dx, (or any 1D series body that are OK with AF at F8.)
This has to be qualified as well.
Although the combo AF works on a 1D series it tends to be slow as well and not very good at it indoor and dark venue...

You will be much better off in term of focus speed and image IQ with a Bigma: http://forums.steves-digicams.com/ca...00-os-hsm.html
Plus this 50-500 is 'brighter' than the 100-400L/TC combo as it'll work on all Canon bodies, has a wider zoom range , and it doesn't pump airdust to the sensor!

Oh and this lens also comes with IS now... and most likely more affordable than the above combo (it's just not painted white)
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Old Jan 25, 2013, 8:34 AM   #5
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True, the AF systems need light to work.

Or optionally you can wait for the new "Canon EF 200-400 f/4L IS 1.4x" to become available on the market. It has a built in 1.4x TC that can be enabled with the flip of a switch, but there is a snag.

The snag being that the estimated price should be in the 11,000$ range.
It will be a great tool for pro sports shooters, not sure about most other people.
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