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Sony A6500: '4K Output Select' Menu Configuration Grayed Out

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Not sure where where else to go. I rented a Sony A6500 to Livestream my upcoming Saturday July 3rd wedding along with an Atomos Capture Card and connecting HDMI to micro HDMI cable. I have been following several guides to make sure that the Camera is outputting resolutions and framerates that the Capture card can handle. The Sony A6500 does not seem to be giving output at all. When I connect to to  Open Broadcaster Software (OBS) software and try to add it as a video source I get this vertical colored bars. This is OBS's ready signal to say it is waiting to receive input.

I have independently confirmed the capture card works and the HDMI setting and internal recording settings (resolution, fps) are withing what the ATOMOS can handle.

Under the Setup Menu, page 4 there is the ? 4K Output Sel. entry which I believe sets how you output HDMI signal from the micro HDMI port on the side. This 4K Output Sel. setting is grayed out and disabled on my camera. When I try to select it, I get the error message "This Function is currently disabled". I believe there are a number of different diagnosis for this problem. One that I am aware of is during slow motion or quick recording 4K Output Select is not available. I cannot find one single slow motion or quick recording setting to turn off, but I was hoping this forum could provide helpful tips to diagnose this problem. I am trying to salvage this setup but am considering other options at this point. I

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    • I mostly see posterization artifacts, which are the result of lossy compressed RAW files (or bad jpeg conversion). Unfortunately, the A6400 doesn't offer uncompressed or lossless compressed RAW. The noise might indeed result from the smaller sensor than what you're used to. If you're not shooting at max aperture, you could try shooting at wider aperture and lower ISO. When you're not shooting at max aperture, fullframe versus APS-C shouldn't matter much in terms of ISO-performance combined with depth of field: at the same ISO and aperture value, fullframe offers better noise performance but with a narrower depth of field. This can be offset by choosing a larger aperture and lower ISO on the APS-C camera. If you want a fullframe camera the size of an A6400, try the A7C(ii).
    • ..unfortunately, the lighting was correct. The shot required deeper shadows. The K1 ff didnt have these banding issues [yes, I know the sensor is larger]. The film shots had details in the same light. The sony files, both the jpg and raw, had this banding/noise - with NO retouch or post adjustments [straight out of the camera]. the camera was purchased new a few years ago and I am trying to determine if there is something wrong, or the settings are wrong, or the camera just cant handle this kind of lighting [studio + softbox]. No shadow detail is one thing... banding/noise in the shadows is unacceptable. Does sony have a body this size that is FF ? Im wondering if that would make a difference..  dw
    • The root causes for banding are uneven lighting, incorrect exposure settings, or compression artefacts or certain kinds of artificial lighting, especially LED lights. Also the lens used plays a role, I have noticed it more with my sharpest lenses, looks like they outresolve the sensor when I have a uniform blue sky. There is more than one solution, and ultimately post-processing, but the root cause has to be identified first.
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