Sigma 2X Convertor

[bookwyse]

OK guys,

Are these any good and will they work on the Canon 70 - 200 4.0L as well as my Sigma 120 - 400. Or am I better off getting a Canon convertor??

 

[PsiFox]

It might work on the 70-200 but might also rub on the rear element.

General rule is attach sigma tc for sigma lenses etc. unless you by a kenko then might still have the rubbing problem

 

[effnik90]

I have a sigma 2x convertor and nikon gear, I asked sigma if the convertor would work on a nikon 300 lens and was assured it would

 

[PsiFox]

I have a sigma 2x convertor and nikon gear, I asked sigma if the convertor would work on a nikon 300 lens and was assured it would

Some they will some they won't.

 

[markta]

Defo suggest and recommend the Canon one, for a Canon lens, but you will lose two stops though. Sorry if I'm teaching you to suck eggs

 

[olv]

140-400 f/8, can't imagine it being overly useful, you'll almost certainly lose autofocus. not sure what the max aperture on the sigma is but can't imagine it being that fast?