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Canon Extenders don't fit 70-300 f4-5.6L IS ???

Started Dec 21, 2012 | Discussions thread
OP Dave Seeley Senior Member • Posts: 1,760
Re: before you send them back ...

Lemming51 wrote:

"The Canon 70-300 L is officially NOT compatible with Canon extenders. This is the only Canon L zoom lens with a widest focal length of 70mm or longer that is not compatible with Canon extenders (as of review time). I've tried mounting Canon extenders to the 70-300 L - and they do not fit. The rear 70-300 L lens element physically hits the front element of the extender.

"Then, in a major firmware update announcement for the Canon EOS 1D X, Canon included the 70-300 L and Canon EF 1.4x III Extender combo on a compatibility list. Intrigued, I did more experimenting. What I learned is that the 70-300 L's rear element retracts into the lens far enough that, at about 250mm, there is enough clearance for Canon extenders to mount.

"The available with-1.4x focal length range is about 350-420mm and 500-600mm with the 2x installed. Zooming out wider than the 250mm-or-so zoom ring mark results in a physical bump inside the lens. I'm guessing that it is the rubber around the edge of the extender element contacts the rear 70-300 L lens element or its barrel. I do not recommend mounting this combination due to potential damage the to lens. ..."

Thanks Lemmings51...  that certainly explains it.

Dave

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current kit: 5DmkIII, 17-35/2.8L, 28-70/2.8L, 70-200is/2.8L II, 70-300/4.0-5.6L is, 100 macro/2.8L, 50/1.2L, 2x II extender, 8x550ex Speedlites, Phottix Odin Flash Triggers

 Dave Seeley's gear list:Dave Seeley's gear list
Canon EOS 5DS R Canon EOS R Canon EOS R5 Canon EF 50mm f/1.2L USM Canon EF 70-200mm F2.8L IS II USM +8 more
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