Canon Extender EF 2x II - Converter

[nigelcampbell]

I'm considering getting a 2x converter - does anyone know how well it would work with the following lenses in terms of quality?

Canon EF 100mm f/2.8 Macro USM
Canon EF 70-300mm f/4-5.6 IS USM

[StewartR]

It won't fit either lens.

[grumpybadger]

It won't fit the 70-300 and I'm not sure it will fit the macro.

[nigelcampbell]

will any extender fit these lenses (weird that canon state that it will fit all EF lenses if that's not true!!)?

[CScottMcQueen]

To be honest I had a kenko 2x convertor with a 75-300 lens and the quality was very poor. The kenko will work with both but its not upto canon quality i'm afraid.

[grumpybadger]

As Scott says, Kenko will fit but quality is lacking. Don't know where Canon say they will fit any EF lens. From their website

Extenders are only compatible with selected EF lenses, including the EF 70-200mm f/2.8L USM, EF 70-200mm f/2.8L IS USM, EF 70-200mm f/4L, EF 100-400mm f/4.5-5.6L USM, EF 400mm f/4 DO IS USM and fixed length L-series lenses of 135mm or higher.