100-400 paired with A9/1.4x TE or A7IV in crop mode?

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Geekapoo Senior Member • Posts: 2,560
100-400 paired with A9/1.4x TE or A7IV in crop mode?

I'm currently shooting BIF with a Sony RX10 IV or a Fuji XT3/100-400. I'm disappointed in the Fuji AF-C it's not as good the RX10IV bridge zoom (too many slightly OOF shots). Also, the Fuji takes a further hit with respect to AF-C performance if I use a 1.4xTE.

I don't think I will like the ergonomics of a Sony APS-C camera paired with a long lens or the camera's EVF resolution. So, am thinking about buying either an A7RIV or an A9. I'm having difficulty making a decision. What's tricky is that I need to rule out the 200-600 due to it's weight (arthritis issues), instead going with the Sony 100-400. I'd like to reach at least 560mm on the long end. I tend to shoot 5-10fps.

I've narrowed down my choices to:

A7RIV/100-400/shoot in crop mode to reach 600mm

A9/100-400/1.4xTE to reach 560mm

Both the A7RIV and A9 should give me a vastly better AF-C experience than the Fuji. I'm leaning towards the A7RIV. I'm not terribly concerned about A7RIV's higher ISO noise (vs the A9) and don't necessarily need very high fps. Also, I might want to take advantage of the use of the full sensor, though at this time really only want the kit as a wildlife camera.

The price for an A7RIV kit is only a couple of hundred dollars more than the A9 kit (A9/100-400/1.4xTE). Does it make sense to go with the A7RIV. In addition to passing on the A6XXX, I also have tentatively excluded the A7RIII as an option due to the upgrades in the A7RIV. Not interested in the A9II or the A1. Again, cannot use the 200-600 due to weight issues.

Thanks for any comments. Some RX10IV and XT3 pics can be found in the link below.

 Geekapoo's gear list:Geekapoo's gear list
Sony RX100 Fujifilm XF 16mm F1.4 R WR Sony RX10 IV Fujifilm X-T3 Sony a7R IV +12 more
Fujifilm X-T3 Sony a9 Sony RX10 IV
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