Is a teleconverter useful?

Started Oct 25, 2011 | Discussions thread
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neilgc
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Is a teleconverter useful?
Oct 25, 2011

I just read this article and it got me thinking:
http://www.slrgear.com/articles/canon_tc/canon_tc.htm

If it is true that the TC is just "cropping" what the lens sees and that the best a 1.4x TC could do is give 10/14ths of the original resolution of the lens, minus any degredation from optical imperfections (seems logical); then what is the point? Would it not be better to simply crop the image from the unconverted lens. I make the assumption that the camera is sufficiently modern that its resolution is not the limiting factor.
Neil

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