[Slicker]

Will all teleconvertors work with EF and EF-S lenses, or should I look a bit more carefully before purchasing?

Thanks

[Dabhand16]

Not got good knowledge of Canon gear, bit I think you have to watch out for the rear element of the lens touching the converter lens elements if it protrudes from the mount.

Someone who knows for sure will be along soon.

[silkstone]

The quick answer is no. There's a list of compatible lenses here...

Canon Extender EF Lenses - Canon UK

For maximum compatibility, I'd recommended the Kenko TCs which do not have a protruding element and will fit most Canon and third-party lenses. You may lose autofocus with any TC, depending on the max aperture of the lens. The 1.4x TCs are better here - you still lose one stop of aperture but they should work with lenses f/5.6 and faster, or L-series lenses f/4 and faster. There's a little trick to get L-series lenses working better with 2x TCs where you normally need a max aperture of f/2.8 for AF to work, but I'll leave that for now.

[Slicker]

ok - thanks for th link... I will have a read

[Chris H]

There's also a Blue Peter style 2 minute non destructive modification to kenko Teleconvertors to allow auto focus on lenses f5.6 and lower.

Mind you it may work with all teleconvertors

[Dabhand16]

Originally Posted by Chris H

There's also a Blue Peter style 2 minute non destructive modification to kenko Teleconvertors to allow auto focus on lenses f5.6 and lower.

Mind you it may work with all teleconvertors

Sticky back plastic?

Or electrical tape perhaps?

[Chilliman]

Originally Posted by Slicker

Will all teleconvertors work with EF and EF-S lenses, or should I look a bit more carefully before purchasing?

Thanks

They will only work with L lenses, Here is a list of compatible lenses ---> Clickity Click, this covers both .1x4 & 2x. I have hired both just now but not had much chance to test them. You could hire them here Clicky Here 12 quid each for a week to find out which suits you best before buying

HTH

Whoops! some fast typers here LOL

[Slicker]

wow - only with L lenses. I didn't expect to here that....

[gsgary]

Originally Posted by Chris H

There's also a Blue Peter style 2 minute non destructive modification to kenko Teleconvertors to allow auto focus on lenses f5.6 and lower.

Mind you it may work with all teleconvertors

And probably burn your camera out

[silkstone]

No, it's safe enough.

Most (all?) L-series lenses have 10 contacts, whereas other lenses have only 7. If you tape over the extra three contacts, you can get AF working on f/4 L-series lenses with a 2x TC.

[Chris H]

And probably not burn out the camera I use it on mine.

One small peice of sticky tape accross 3 pins, stops the camera detecting it has a teleconvertor on it. The camera then auto focuses without problem

[Steve]

Originally Posted by Chilliman

They will only work with L lenses,

Originally Posted by Slicker

wow - only with L lenses. I didn't expect to here that....

That is because the information is incorrect

I have just tried a Kenco 1.4x Pro300 DG convertor on a Canon 50mm f/1.8 and a Tamron 28-75 f/2.8 lenses with my Canon 20D and both work perfectly. I know this is not an exhaustive list but those are the only non L lenses I own.

[silkstone]

To clarify.... As I said in post #3 above, the Kenko and most third-party TCs should work with any lens (subject to AF limitations with slow lenses). The Canon 'Extenders' are guaranteed to work only with the lenses listed in the link I gave. That's because they have a protruding