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Rf 100-400mm f5.6-8 + 1.4 extender

Started Jan 30, 2022 | Discussions thread
John Sheehy Forum Pro • Posts: 26,688
Re: Rf 100-400mm f5.6-8 + 1.4 extender
1

here_and_there wrote:

John Sheehy wrote:

here_and_there wrote:

Good point. However, the 600 is almost twice the weight of the RF 100-400,

Are you sure about that? I thought that the RF100-400 + RF1.4x is about 1.9 pounds, while the RF600/11 is about 1.7 pounds. The RF800/11 is about double the weight of the bare RF100-400.

and I guess twice the size since it needs to be extended to be used. And no zoom.

I hadn't realized how much those extenders weight. I stand corrected.

So the 100-400 zoom trades off some IQ for a slimmer but heavier package than the 600 f11, extended length seems to be about the same for both; but the zoom gives variable focal length, and maybe better AF (nano-USM v. STM)?

As always a tradeoff between IQ and size/weight/convenience. Both are nice options.

There is no one lens that is best at everything; my EF400/4 prime can give more sharpness, less noise, and shallower DOF than my RF100-400, but following an active subject with the 400/4 is like steering a boat, while doing so with the RF100-400 is more like steering a bike. In good light, the RF AF is a little faster, despite 2 stops, and when I lift the slow RF to initiate AF, the subject is less OOF and the AI AF is more likely to lock immediately onto what I am shooting, whereas the 400/4 might result in an AF stall or hunting when the background is much further away from the subject. If light is very, very low, the 400/4 may focus better or keep the R5's live view going at 120Hz when it may have dropped with the slower zoom.

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Beware of correct answers to wrong questions.
John
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