Sigma Teleconverter with Canon Lens

[shady]

Hi All

I am new to this excellent forum and have a query which I would be grateful for help with.

I have recently purchased a Canon 100-400 IS L and I have a Sigma 1.4x Teleconverter (DG). I have heard that these are compatible but Sigma tell me the official answer is that they are not!

This is probably the most expensive lens I will ever buy (unless I win the lottery) so I would not like to break it!!

Has anybody actually used this combination?

Best regards
Shady

[mcapper]

Hi Shady

Welcome to Birdforum. I'm afraid I don't the answer to your query but I'm sure someone will.

I want the 100-400 IS lens but haven't saved up enough yet!

Matthew

[John N]

Hi,welcome to Birdforum.

[Bill Atwood]

I've never heard of 3rd party TCs damaging Canon lenses. Only that the electronics didn't work, thereby disabling autofocus and exposure control.

[skiel]

I've used third party tc's with my canon 70-300. I must revert to manual focus but have never had any issues with the lens when used without the tc. It continues to perform flawlessly.

[postcardcv]

The Sigma tc can cause problems with zoom lenses - it has a protruding front element that can make contact with the back end of a zoom lens, so I'd recommend that you check this carefully before trying it out. It may cause damage to the convertor, or even worse, the lens.

Either a Canon or Kenko 1.4x tc should work fine with this lens, but you will not get AF with any of them unless you're using it on a 1D body!

[stuartlawrie]

I have used the sigma 2x convertor with the canon 100-400L lens with no problem, so assume same would be true of the 1.4x tc.

[Aschlaman@comca]

I used the Sigma 1.4x with my Canon 100-400mm yesterday. No problems

Art Schlaman
Downers Grove, Illinois USA

[PWG]

The Sigma tc can cause problems with zoom lenses - it has a protruding front element that can make contact with the back end of a zoom lens, so I'd recommend that you check this carefully before trying it out. It may cause damage to the convertor, or even worse, the lens.

Either a Canon or Kenko 1.4x tc should work fine with this lens, but you will not get AF with any of them unless you're using it on a 1D body!

The Sigma TC sticks out only a fraction of the canon one.

[fleisher]

I have the 300D and have used the Tamron 1.4x teleconverter with my Canon 75-300 IS lens with full auto-focus. I have also used it in conjunction with the Tamron 200-400 and have full automation.