My Z9 will be here soon. I am a non professional shooter. I just cannot convince myself to spend 6k for the Z800 PF. I can get the 500 PF lens for $3,295 right now, but it is not a Z lens. How is the tracking and focusing with the Z9 and the 500 PF?
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The 500PF is, IMO, as good or better on the Z9 than it is on F-mount cameras. I've had a lot of fun with it on the Z9
However, it also does not have all the features you find with a Z mount lens - lens fn buttons 1 and 2, control ring, etc. It also works differently from a control standpoint. IMO, there is value to having consistency from lens to lens and it's one of the things I'm struggling with at the moment with my Z9. I have a mix of adapted glass and F-mount glass and it's tough to set important functions to things like lens fn2 buttons and control rings when not all of my lenses have those options.
So, it's not an easy call...
I have perceived no problems at all using F mount lenses on Z mount cameras, and this includes using the 500mm PF on the Z7 and Z9. If anything, using the lens on a Z camera is superior because the focus points cover the entire frame and one can attain autofocus at very small apertures compared with an F camera. I have used my 500mm PF with the TC20eiii on the Z cameras, which means 1000mm f11, and the results are excellent. At that small an aperture autofocus is a bit slower--there is no "free lunch" here--but the optical results are amazing.
The 400m f4.5 is undoubtedly an excellent lens, but the bottom line is 500mm vs 400mm. If your main use for the lens favors 500mm, I would have no compunctions at all about getting the 500mm PF, which, after all, is actually available NOW, as opposed to who knows when the 400 will actually get into the hands of ordinary folk. I will add that I don't really use the fn2 buttons. Maybe my loss, but ignorance is bliss
I love my 500PF and just used it for almost three weeks in Yellowstone with the lens firmly attached and never leaving the Z9. It's a great lens for any camera. I'm taking it to Africa in a month or so. I think you will be happy with it and the ability to handhold the setup, even though the camera is heavy.
I don't use the lens buttons either. And I love the 300PF and 500 PF on my Z6II
Another vote for the 500PF on the Z9. I find it just as easy to use as the Z 100-400 and not noticeably more heavy - with 100mm extra reach.
The Z9 and 500PF are a killer combo. I spent two months in Ecuador this spring with that combo photographing hummingbirds, tanagers, toucans, and primates. The z9 brought new life to that lens after using it with the D850 for the last couple of years. The 500PF is at that perfect balance of weight, reach, and quality. It gets way more use than my 600 f4 fl.
I found the 500 PF w/ TC 1.4 is much faster to AF on a Z9 than on D850. Much faster.
If you asked me whether to get the 400 f/4.5 or 500 PF, I could not answer that. I like the extra range of the 500 PF (can get to 700 w/ 1.4 TC) but prefer to simplicity of having all my lenses native Z mount and not having to use/carry a FTZ and an extra set of TCs (down to 3 FX lenses: 180-400 which is fantastic lens, hope someday Nikon updates this lens; 500 PF which might be replaced by the 400 F/4.5, and Sigma 150 Macro. If nikon ever made a collared long macro I would switch).That is especially good to hear and backs up even further my decision to go buy this lens.
The 500 pf worked on both my Z6II and Z9 as well or better than they did on my DSLR's, but as @Steve pointed out it is not a Z lens so does not have the function ring and other Z lens features I like. I just got paid this afternoon for the 500pf I sold. Being a bird photographer first and everything else next the 500 consistently had to short of a focal length for me. The 500 used to be a back up to my 600 f/4E now with my Z100-400 and my Z800 PF it was never used so sold it.
I have now sold all of my f mount lenses (except for a 50mm f/1.8). I just ordered a Z400 f/4.5 for my wife since she likes the specs for size and length etc..
500mm pf works beautifully on the z9 from my experience. No problems. Sharp piccies.