Recommend a 1.4x and 2x for my non-L lenses?

[JumboShrimp]

What is the latest consensus for the best "third-party" TCs these days? Have been using a Tamron 1.4x SP AF TC for many years but it probably could use upgrading. (Yes, am aware of light loss, AF troubles, and those things, but that's OK.) Ah, but ... if only Canon made such a thing, I'd be all over it. Primarily shooting with a 6D which I love. Suggestions?

 

[heptagon]

For which lens?

 

[JumboShrimp]

For all my non-L lenses, or should I say all lenses which won't accept the Canon TCs. Such as: 24-105/4, 70-300/DO, etc. Just for the so-called "emergencies" when you need some reach.

 

[rs]

For all my non-L lenses, or should I say all lenses which won't accept the Canon TCs. Such as: 24-105/4, 70-300/DO, etc. Just for the so-called "emergencies" when you need some reach.

It varies from lens to lens, so if you want people with hands on experience to answer, best to say which lenses

The general rule for Canon extenders is they're meant to work with all the white L lenses and nothing else, but like most rules, there are exceptions. The 70-300L is a white L which isn't supported (but it will work from 270mm onwards), the 180L is black but it works, the 400/4, while white it isn't L, but it works, and there are non L black lenses such as the TS-E 90 which work.

Incidentally, your 24-105 is an L lens