EF 1.4x Converter

Excellent build quality. Feels solid, with well made materials & components. Again, excellent image quality, especially when used with the Canon EF 100-400mm IS USM Lens.

Very easy to use. A cost effective way of increasing the focal length of long lenses

Nil

Does what it says. Useful addition in good light.

Lack of autofocus when used with 100-400 Canon zoom. It is hard to find this explained very clearly in any sales literature.