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HI,
this might sound as a strange question, but is it possible to record from a portable audio recorder (with mic) for instance a zoom H4N into the xlr inputs of the if-box? Google didn't really help, I only found info around hdslr.
How do you mean MR? The XLRs on the IF box are an input, the sound going to them would be laid onto the HD-SDI output, so if you had a recorder on there then the sound would be recorded.
The F35 is really built as a separate sound machine, to be honest
If you are recording to a device such as an Odyssey7Q+, then the embedded audio on the SDI stream would be captured. So you could take the output of the Zoom, feed it into the IF box to embed, and then record this on the Odyssey.
The IF box audio circuitry is top notch, but it doesn't offer any level adjustment. If you use an external mixer and feed to the IF box, the results should be as good as the external mixer and operator are. Mind you, the Zoom is very much the low end of the market.
IF box audio is fed out only - you will not get the IF fed audio on the other dock port or on the monitor ports. Also, there is a camera menu setting that controls whether the IF box audio goes to SDI audio channels 1/2 or 5/6. Some SDI recorders may ignore the 5/6 audio.
I would say that the F35 was designed to have audio mixed separately - but not necessarily recorded separately - although, most productions that could afford the F35 in it's prime likely did record audio separately, if only as a backup.

As long as you properly setup your chain with tone etc etc... then the sound quality should be superb. The F35 won't be detrimental to the quality of the sound, at all.
I would really advise against trying to use the F35 as a one-man-band though, I know a few on here have, but it's really outside the camera's comfort zone.
M.R. - are you using a Hyperdeck? I think we found that the Hyperdeck records 8 tracks without the option to only record 2. Atomos and 7Q will record 2 channels properly.
Haha that's me and my F35 above. I almost exclusively use the 7Q instead of the pix240i at this point, but the nice thing about the pix was its audio capabilities, mainly in control and input (thought at a power and size cost....)
I have had really good success recording scratch audio through the F35, whether through a scratch mic or a line output from the sound mixer, but almost always would re-sync and use in post. Depending on what I was doing I would feel pretty comfortable one man banding it with the F35... though even with a simpler camera in a one man band situation if audio was going to be complicated enough that I needed to ride levels I would probably try to find someone to be dedicated to sound.... like I would never be changing levels too much on something on my FS7 or anything like that... I'd basically treat it very similar to how I'd treat the F35.
That being said, the F35 seems to have a solid amount of overhead before clipping and has pretty robust audio circuitry (beyond it being limited). I've used stuff I've recorded through the IF box/7Q and it's sounded great.