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EF 100-400mm f/4.5-5.6L IS II vs EF 300mm f/4L IS + Ext. 1.4x III

Started Jul 25, 2015 | Discussions thread
dhogaza Regular Member • Posts: 343
I bought the 100-400II, my 300/4 +/- 1.4xIII hasn't been used since

Ignoring image quality for the moment, AF is much faster with the zoom than with the 300+1.4x combo.  IS on the new zoom is the latest four-stop, three-mode IS, same as with my 600/4 MK II.  IS on the 300/4 is first generation, not nearly as good.

Now regarding IQ, while I've done no systematic testing, my 100-400II is extremely sharp, while the 300+1.4x doesn't match it IMO.

So the new zoom is a total win ...

Oh, it's heavier and bulkier than the 300+1.4x, but I don't mind that.

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