EF-S Extenders

Paul_Iddon

5

11 Feb 2012 - 11:29 AM

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Why won't (or can't) Canon (or a third party) make a x1.4 or a x2 extender to fit on EF-S lenses and bodies?

Surely with the brains and technology available now, some manufacturer could surely do this to give us EF-S users an extra option.

strawman

8

11 Feb 2012 - 11:56 AM

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The problem lies with the EF-S lens specification (only applies to Canon's own lenses) the lens can go back into the body so the rear element can move into the space the teleconverter has to be in to work. You can use a teleconverter on EF lenses on any of the canon EOS cameras it is just the EF-S lenses that cannot fit onto the converter.

The camera bodies accept the converters. So just buy long lenses that are EF ones not EF-S. the only EF-S that would be an issue is the 50-250, which is fine as a budget lens but not one I would fit a TC to.

strawman

8

11 Feb 2012 - 12:08 PM

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Whist there may or may not be issues of desire to control the market, there is the honest technical reason that Canon created the EF-S mount to take advantage of the smaller mirror and so push the rear lens element into the body to make the lens shorter. They had to make it different to prevent people fitting EF-S lenses to large mirror cameras and the teleconverter elements.