-=FAQ=- Teleconverter/T-Con Tele extender Discussion

Well, I took my 20D to the camera shop to see which teleconverters would autofocus with my 400 f/5.6L. I already have the Canon MkII 1.4x and it will not AF with the 20D and 400 f/5.6L.

So I will list the ones I tried and whether or not they autofocused with a 20D and 400 f/5.6L:

Kenko Pro 300 1.4x DG: NO
Kenko Teleplus DG 1.5x: YES
Sigma 1.4x EX DG APO: NO
Tamron Tele-Converter SP AF 1.4x: NO
Tamron Tele-Converter AF 1.4x: YES

I also Have a Kenko Teleplus af 2x DG MC7 that will autofocus with this combination.

I ended up with the Kenko 1.5x for less than $90 and will be running it through it's paces to see how it performs optically and I will try to compare using it against the Canon MkII 1.4x (which I'll have to use MF) next week on vacation. I will report back here with my findings.

Regards,
Jeff

Awesome addition Big Hands! thanks for that info.

Will a Canon 1.4x TC mkII work on non-Canon lenses?

Some. It's, for the most part, interchangeable with the Sigma TC. If the lens has a large enough opening for the proruding front element of the TC to get in, it'll work. IIRC suitable lenses are listed up at the top of this sticky. If you're looking for a TC and are sure you will want to use it on other than the specified Canon and Sigma lenses, get someone else's.

Jon can you point me to the post indicating which non-Canon lenses will work with the Canon 1.4x TC II?

The very first one on this thread. If any other than Sigma or Canon will work, they've been reported individually.

The first post mentions which Canon lenses will work with the Canon TC. I want to know if non-Canon (sigma lenses) will work with the Canon TC 1.4x

Go down and read the paragraph on Canon lenses and Sigma TCs.

Jon, thanks.

Too bad, I wanted the TC specifically for this lens. No matter, the 135 L does splendid with a 2x TC, so a 1.4x TC is not asking much.

Does anyone know if the Kenko 2x AF Teleplus DG MC4 Autofocus Teleconverter will work on the EF 70-300mm f/4-5.6 IS USM? I'd be most appreciative if anyone can help me out!

For that matter, would the below work with the EF 70-300mm f/4-5.6 IS USM?

http://www.bhphotovide​o.com …ghType=category​Navigation

Torquemada wrote:
Does anyone know if the Kenko 2x AF Teleplus DG MC4 Autofocus Teleconverter will work on the EF 70-300mm f/4-5.6 IS USM? I'd be most appreciative if anyone can help me out!

For that matter, would the below work with the EF 70-300mm f/4-5.6 IS USM?

http://www.bhphotovide​o.com …ghType=category​Navigation

I have the Tamron 1.4 MC4, and the Kenko 2.0 MC7

Canon EF 70-200mm 1.4 retains autofocus, 2.0 retains autofocus, stacked loses autofocus
Tamron 70-300mm 1.4 retains Autofocus, 2.0 retains autofocus if the subject is bright and definite, hunts frequently in slightly under enough light situations, stacked, loses autofocus completely
Canon EF 50mm 1.4 Retains AF, 2.0 Retains AF, stacked, loses AF

If that helps any

Which 1.4x convertors has the poorest effect on autofocus speed and accuracy? Canon, Sigma, Tamron, Kenko?

my tamron and kenko, separately mated to the L seems to act like they arent even on there.. the tamron lens on the other hand, hunts, im not sure it its the TC that really affects those areas, i think maybe its how the different lenses react with the TC

Was reading the first post and there was a mention that there was a complete haul over for the optics of the Canon 2X MKI TC to produce the current MKII version that allows the Canon 1.4X TC to be stacked onto it.

I've got a chance to lay my hands on a Canon 2X MKI TC and I already have a Sigma APO EX 1.4X TC, and I'm contemplating stacking the two onto a 300mm f/4 to see what effect I can achieve. I know this comes with problems such as loss of AF and reduced IQ, but can the TCs physically be stacked together in the first place?

Does anyone know if the 2X MKII is any better optically when compared to the MKI version? Thanks...hope someone can help on this.

First time out today shooting motorsports with the new 1D MKII N holy cow! It autofocuses the 100-400mm "L" with the 1.4x just as fast without it! Also I have the Kenko 2x MC4 DG, which autofocused amazingly as well!
QUESTION: I want to upgrade the MC4 2x to the Kenko 2x Pro300...Does the Pro, AF like the MC4?