LFingar Loc: Claverack, NY

Hate to say it, but putting down the fox would probably be the humane thing to do. Right now it is living a tormented life. Notice how torn up it's ears are from scratching? I don't know that a rehabilitater can, or will, do anything for it. The wardens will know if there are available options. Good luck!

dugole Loc: Matawan, New Jersey

I use that combo with my 5D Mk III. With the Mk III teleconverter focus speed is much, much quicker than when I used the previous version. IQ degrades only slightly - not so noticeable using minimal cropping. The major drawback is that with this combo I only get the use of the center focal point - tough with moving objects such as BIFs. I'm upgrading to the 5D Mk IV (1st on the waiting list) in 10 days - so using the 100-400 with the 1.4 I will available all focal points at F8. I think that will allow me to use the 1.4 much more often. The 100-400/1.4 combo is comfortable to use with the single focal point being the only drawback as far as I'm concerned.

markngolf Loc: Bridgewater, NJ

Thanks for clarifying. I did not think it was personal. Sometimes, maybe often, that happens with threads on UHH.
Mark

davidrb Loc: Half way there on the 45th Parallel

And I apologize if the impression was given that required you to do so. This discussion is getting to the "meat" of an important issue. A/F issues are becoming more prevalent with newer cameras. The 1-DX needed a firmware update to allow it. Now, selective cameras are being included in the group that are capable of doing so. Hopefully, they all will be able to A/F at any aperture setting in the near future. Discussion as this are good learning points for us all. Not everyone understands the "whys" and the "why nots" involved and these discussions get us all into the topic. We all can learn, that is why many of us are here.

robertjerl Loc: Corona, California

The old version won't work with the 1.4X!!!!!
Then I guess I had better stop using it. Or did you mean the 1.4X II? and the 100-400 mk I?
My 100-400 mk I and the 1.4X III work just fine together.

CHG_CANON Loc: the Windy City

Another magic of the 80D, 1DXII and now the 5DIV is the use of 61 AF points with lenses / extender combinations at f/8. This is a game changer for anyone with equipment that will exercise this feature.

robertjerl Loc: Corona, California

Alas the 80D only does 27 cross type AF at f/8.
only

CHG_CANON Loc: the Windy City

Oh well ... 27 is still greater than 1 for all cameras before ...

Nalu Loc: Southern Arizona

Personally, I would not go out in the field without a 1.4x. I now have two so I can use them with both my 7DII and 1DX when I am chasing birds. I never seem to have enough reach. As noted, with the 7DII, considering the combo will put you at f/8, you are going to need good light to keep the ISO relatively low. What I find with the 7DII, if I can get close to 50% of the frame filled with the subject, and of coarse you are well focused, at an ISO at or below 800, you can get pretty good images. On the other hand, if you need to do much cropping to get the composition you are looking for and the ISO is up you are going to notice some noise which may or may not bother you. It does me. You can get rid of it in post, but assuming it is impacting your subject, things can get a little soft. From what I understand, you have a great lens in the 100/400II and you definitely need a 1.4x to go along with it. And you have a combo that is relatively light so with practice, you should be able to hand hold it, a great advantage with moving subjects. But from my perspective, once you put that combo on a full frame camera with a relatively fast burst speed, you are really going to be stoked.

Just me. Get it.

LFingar Loc: Claverack, NY

Thanks everyone for your comments and info. I just ordered the EF 1.4X III from B&H. I'll have it Tuesday.

imagemeister Loc: mid east Florida

Especially for only a 1.4X FOV reduction, cropping with pixel enlargement on a decent high density sensor is a better all around solution IMO.

imagemeister Loc: mid east Florida

I realize this is a hard pill to swallow and you will feel guilty for even thinking about it ! ( and NOT even spending any money ! )

But, I have used the Canon 300 2.8 with Sony's Clear Image Zoom and with Canon's 2XII - so I do speak with experience. The results are astounding - IMO.

mwsilvers Loc: Central New Jersey

Remember, the combo will make the maximum aperture f/8 and on the 7D Mark II you will only be able to use the center point for AF. You probably already knew this, but just making sure.

mwsilvers Loc: Central New Jersey

Great, congratulations. It and the 100-400 mm version II work great together.

Nalu Loc: Southern Arizona

"pixel enlargement" Larry, what are you talking about?