11-19-2018 11:10 AM
11-21-2018 10:54 AM - edited 12-02-2018 01:16 PM
Asked and answered! The Canon EF 100-400mm f/4.5-5.6L IS II USM Lens can use the 1.4x tel-con.
11-28-2018 04:21 AM
12-02-2018 12:57 PM
Which camera body?
The 70-200 and 100-400 are completely different beasts. The 100-400 is pretty much just for telephoto photography (action/sports/etc.). It's fantastically sharp and pairs well with the Canon 1.4x tele. But there is a deliberately focus-speed reduction when you use the lens with the tele-extender (it will not focus as fast as it will without the tele installed ... and that's something Canon documents.)
The 70-200 is probably my most used lens. I use it for a lot of things where people might use a shorter lens (when I have a choice between photographing something at shorter focal length and standing closer to the subject, or longer focal length standing farther from the subject... I pick the longer focal length and farther distance. It love the look, the angle of view, the shallow depth of field I can get at f/2.8 (or even f/4) and the blur quality of the 70-200 that the 100-400 doesn't have.
But If I'm shooting a sporting event... I'm probably using the 100-400m so I can more easily "fill the frame" in ways I probably can't do at 200mm.
This is why I say they're completely different beasts. The 70-200 does some things you just can't achieve with the 100-400... and the 100-400 does some things you can't achieve with the 70-200.
That said... you already have a Tamron 150-600. I'm not sure which version you have (Tamron has made several 150-600s). The Tamron is covering most of the same range as the Canon 100-400, but the Canon has a reputation for being extremely sharp.