Extender

[sting]

I have a canon 1.4 extender and only use it with my 70-200 is it possible to use it with my 17-55mm (apologies if this is a stupid question)

 

[Big Andy]

I think you can only use extenders with ef lenses not with efs which I belive the 17=55 is. Also they don't work well with shorter zooms as I understand.

 

[aeronic]

Why would you want to turn your 17-55 into a 28-85 f/4 lens??

 

[pockets]

Would the element of the extender not interfere with your choice of lens? seems a bit pointless to be honest.

 

[StewartR]

Let's save some time and have a definitive answer: NO, you can't do it. Your Extender won't physically fit on the lens.