FF vs. APS-C

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Conclusions

Are TCs "worth it". The answer is yes, as long as you use them with a good lens, preferably a prime lens. The tests here show that this TC is very effective with both the EF 50/1.8 and the EF 300/4L, somewhat effective with the EF 28-135IS, but not really useful with the EF 75-300IS. These results back up the "conventional wisdom" that TCs work best with prime lenses.
If you have a Canon "L" telephoto prime or zoom that accepts Canon TCs, the one to get first is the Canon 1.4x TC. It will give higher image quality and better AF (when supported by the EOS body) than 3rd party options

If you need a TC to fit Canon non-L series primes or shorter focal length lenses that won't accept the Canon TC, then there are a number of 3rd party options. Generally the 1.4x TCs will give more acceptable results than the 2x versions.

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Camera and Lens Tests, Reviews, Canon EOS info, Digital Technology - Bob Atkins
Last Modified 12/23/2014 05:30:13

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If you have a Canon "L" telephoto prime or zoom that accepts Canon TCs, the one to get first is the Canon 1.4x TC. It will give higher image quality and better AF