any difference between Extender EF 1.4x I & II?

Started Dec 16, 2008 | Discussions thread
Paul Boothroyd Senior Member • Posts: 1,723
Re: mkII's are stackable, mkI's are not

Kjeld Olesen wrote:

I do not recall chether this is a function of the protrusion of the
1.4 being thinner or the rear hole of the 2x being wider.

To stack the mkI's you had to use a 12 mm extension tube which may or
may not result in a loss of infinity focus. See

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Actually any 1.4x or 2x Extender will stack with a MkII 2x.

It's the MkII 2x which is different to allow this with a larger rear opening - so the 2x has to go on the lens with the other Extender behind and mounted on camera.

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