Canon Extender EF 1.4X III vs Canon Extender EF 2X III with this lens: Pros & cons of each for BIF or just birds in general? Example photos? Would appreciate info from folks who have actually used one or both. Thanks!
1.4EXIII works very good, almost no loss of IQ and a little slower AFspeed
2.0EXIII with 100-400 5.6 gives you loss of 2 stops so you're at f11 which means no more autofocus(it will work in live-view but that's to slow for BIF) and I can't manual focus fast enough


and so have I, and I have both extenders so I was able to give him the information he needed. (and I have nothing against the R but I've had my 5DIV for less than a year and I want it to last at least as long as my 5DIII which I used for 6 years).

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