Canon 70-300 L + extenders on TDP site ???

Started Jan 15, 2013 | Discussions thread
Steve Balcombe Forum Pro • Posts: 12,210
Re: Canon 70-300 L + extenders on TDP site ???

akustykmagmanetpl wrote:

Alessandro77 wrote:


I see on site that Canon 70-300 L has been tested with both 1.4x and 2x extenders III, reaching 420 and 600 mm respectively, but as far as I know it's impossible to mount any Canon extender on such a lens.

So what do I miss?

AFAIR there's a Kenko TC 1.4 which does work with 70-300L.

I've tried mine with an 1.5x TC from Kenko and not only it didn't work with AF - it was impossible to focus with LV as the picture never get sharp. TC was perfectly fine to use with 70-200/4 nonIS.

I have the Kenko Pro 300 DGX 1.4x. Used with the 70-300L, AF can work but you need good light and I found it just too unreliable. It was accurate when it worked but too often AF would fail and I'd miss the shot. People say it works better with zone AF - probably true but I've never tried it.

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