topic Re: Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens? in EF & RF Lenses

Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

tdehan — Mon, 11 Jan 2016 15:39:06 GMT

I received a Sigma 150-600 contemporary lens for Christmas with the Canon mount. I have a Canon Extender EF 1.4x III. Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

Re: Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

jrhoffman75 — Mon, 11 Jan 2016 15:48:45 GMT

The Canon extenders have a nose that needs to be dealt with.

Since you've got the camera and lens give it a try - carefully.

Re: Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

ebiggs1 — Mon, 11 Jan 2016 16:06:06 GMT

I have 1.4x II. I don't have the newer III version. The II will mount on the big Siggy. Now, whether it will 'work' or not it up for debate. I say. no, it doesn't. Also it depends on which Canon camera you have?

IMHO, you should never use a tele converter on any lens slower than f2.8 and certainly never, never less than f4. The Siggy has a max aperture of f5 so it pretty much is a no go. Again, IMHO.

BTW, Sigma makes a 1.4x converter, the Sigma TC-1401 1.4x Teleconverter for Canon EF. It would be a better choice than the Canon which is designed bascially for Canon lenses and not Sigma's.

Re: Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

Commodus — Wed, 29 Jun 2016 03:47:47 GMT

This lens WILL work with a Canon tele-extender if you do this. (An old trick given to me by an old timer at Canon headquarters).
Use a very small piece of tape (preferrably the blue tape used to mask painting on walls) and cut an approx. 3mm by 2mm piece with an exacto knife and stick it to the lens contacts in the back. Now, the important part is to stick it and cover only to the last gold contact that is opposite the bigger contacts on the other side. The tape will not ever come loose no matter how many times you attach and de-attach the lens, so don't worry. This particular contact is for Sigma cameras only, so if you are using a Canon or (probably) any other brand) this will work as well. This will make your Canon tele-extender work with the Sigma lenses.

Happy gigage!

Re: Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

tdehan — Thu, 30 Jun 2016 13:45:41 GMT

Actually... it works just fine without any tape.

Re: Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

Waddizzle — Thu, 30 Jun 2016 16:14:12 GMT

@tdehan wrote:
Actually... it works just fine without any tape.

I would suspect that the camera model, and choice of manually selected AF point, makes a difference, too.

Re: Will the Canon Extender EF 1.4x III work with a Sigma 150-600 Contemporary Lens?

ebiggs1 — Thu, 30 Jun 2016 16:45:38 GMT

"... and choice of manually selected AF point, makes a difference, too."

And....the definition of the word "works", also.