Canon Extenders don't fit 70-300 f4-5.6L IS ???

I just got my extenders delivered today, and clearly they do NOT fit the lens, as the rear element is far too shallow to accept the extenders.  I thought i'd heard otherwise in an on line review, and this shows it with the 2x iii, on The Digital Picture.

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=738&Camera=453&Sample=0&FLI=6&API=0&LensComp=687&CameraComp=453&SampleComp=0&FLIComp=3&APIComp=2

It's the 2x and 1.4x version iii extenders I am trying out.  Is there something else for this lens?

Thanks

Dave

Not that it helps you much now, but here is a compatibility chart.

1.4x

http://www.bhphotovideo.com/FrameWork/charts/canon1_4xExtender.html

2x

http://www.bhphotovideo.com/FrameWork/charts/canon2xExtender.html

Dave Seeley wrote:

I just got my extenders delivered today, and clearly they do NOT fit the lens, as the rear element is far too shallow to accept the extenders. I thought i'd heard otherwise in an on line review, and this shows it with the 2x iii, on The Digital Picture.

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=738&Camera=453&Sample=0&FLI=6&API=0&LensComp=687&CameraComp=453&SampleComp=0&FLIComp=3&APIComp=2

It's the 2x and 1.4x version iii extenders I am trying out. Is there something else for this lens?

You can't just go by the abbreviations on the ISO-12233 page, you have to read the review:

http://www.the-digital-picture.com/Reviews/Canon-EF-70-300mm-f-4-5.6-IS-L-USM-Lens-Review.aspx

"The Canon 70-300 L is officially NOT compatible with Canon extenders. This is the only Canon L zoom lens with a widest focal length of 70mm or longer that is not compatible with Canon extenders (as of review time). I've tried mounting Canon extenders to the 70-300 L - and they do not fit. The rear 70-300 L lens element physically hits the front element of the extender.

"Then, in a major firmware update announcement for the Canon EOS 1D X, Canon included the 70-300 L and Canon EF 1.4x III Extender combo on a compatibility list. Intrigued, I did more experimenting. What I learned is that the 70-300 L's rear element retracts into the lens far enough that, at about 250mm, there is enough clearance for Canon extenders to mount.

"The available with-1.4x focal length range is about 350-420mm and 500-600mm with the 2x installed. Zooming out wider than the 250mm-or-so zoom ring mark results in a physical bump inside the lens. I'm guessing that it is the rubber around the edge of the extender element contacts the rear 70-300 L lens element or its barrel. I do not recommend mounting this combination due to potential damage the to lens. ..."

Lemming51 wrote:

"The Canon 70-300 L is officially NOT compatible with Canon extenders. This is the only Canon L zoom lens with a widest focal length of 70mm or longer that is not compatible with Canon extenders (as of review time). I've tried mounting Canon extenders to the 70-300 L - and they do not fit. The rear 70-300 L lens element physically hits the front element of the extender.

"Then, in a major firmware update announcement for the Canon EOS 1D X, Canon included the 70-300 L and Canon EF 1.4x III Extender combo on a compatibility list. Intrigued, I did more experimenting. What I learned is that the 70-300 L's rear element retracts into the lens far enough that, at about 250mm, there is enough clearance for Canon extenders to mount.

"The available with-1.4x focal length range is about 350-420mm and 500-600mm with the 2x installed. Zooming out wider than the 250mm-or-so zoom ring mark results in a physical bump inside the lens. I'm guessing that it is the rubber around the edge of the extender element contacts the rear 70-300 L lens element or its barrel. I do not recommend mounting this combination due to potential damage the to lens. ..."

Thanks Lemmings51...  that certainly explains it.

Dave

It appears to be Canon EF extenders are only for those costly lenses. Canon says "If you want to use our extenders you need to be worthy enough to buy our costly lenses".

Each lens in the compatibility list for both 1.4x and 2x are $1500 and above.

SportsClicker wrote:

It appears to be Canon EF extenders are only for those costly lenses. Canon says "If you want to use our extenders you need to be worthy enough to buy our costly lenses".

Each lens in the compatibility list for both 1.4x and 2x are $1500 and above.

Have a look at these and see if it makes sense:

70-300:

70-200/2.8L IS II

100-400L II:

Note the distance between the back of the lens and the rear lens element. Also note that the Canon extenders protrude inside the lens:

2x TC III:

1.4x TC III:

Well, this is the only reason why I sold mine... But otherwise, this lens was my first >1K$ L lens and I truly like it. Since that, I bought several more expensive L lens and never regret it.

Also remember that many cameras are not made to focus well with extenders. Something about the focus point beyond f/8 (1.4 extender + f5/6)...

I have the Kenko PRO DGX 1.4 and use it with the 5D3 and the SL1 combined with the 70-300L, works great.

Lee Jay wrote:

SportsClicker wrote:

It appears to be Canon EF extenders are only for those costly lenses. Canon says "If you want to use our extenders you need to be worthy enough to buy our costly lenses".

Each lens in the compatibility list for both 1.4x and 2x are $1500 and above.

Have a look at these and see if it makes sense:

70-300:

70-200/2.8L IS II

100-400L II:

Note the distance between the back of the lens and the rear lens element. Also note that the Canon extenders protrude inside the lens:

2x TC III:

1.4x TC III:

Thanks a lot, I only have 70-300 f4-5.6 IS USM, which is never going to accommodate those extenders. I will have to wait till I get a 100-400 f4-5.6L IS USM.