New answers tagged teleconverter
No. Since some of the optics of the Canon 1.4X and 2X extenders extend into the back of the lens attached to them, they are only compatible with specific lenses. No EF-S lenses are compatible with any version of the Canon Extenders. Here is a link to the list of Canon lenses compatible with Canon extenders. Note that the only lenses with focal lengths ...
No it is not going to work with the EF-S 18-135mm. I don't know of any EF-S lenses that the 2x extender works with. The lenses are too close to the body and would interfere with the area that the extender takes up. More info on why only certain lenses work with the extenders can be found here: Why can only certain Canon lenses be fitted with an extender? ...
The Kenko Pro 300 1.4x TC says it will not work with an EF-S lens like the 55-250. Everything I've read says the 2x is the same. So, regardless of AF issues, I'd say this is a no go.
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