Adding Apple's Built-In Camera Luts through Custom Lut Filter

Adding Apple's Camera Luts through Custom Lut Filter.
Is this possible as they seem to be missing when I add the filter?

I see them in Info Pane, Extended, Camera Lut 
but I need to make an exposure adjustment before adding it.

When I add Apple's Custom Lut Filter I don't see Apple's Camera Luts.
Reveal in Finder shows the path Macintosh HD > Users > username > Library > Application Support > ProApps > Camera LUTs but all I see are two Blackmagic Luts and info.appleuts and no other Luts (e.g Sony) are there.

Obviously, the Luts exist because I can access them in Info Pane Camera Lut. How can I find them using Custom Lut Filter (or can I?) 

Short Answer
Built-in camera LUTs aren't readily accessible as LUT files anywhere. They are supposedly "adaptive" when you choose them (for the ones that come with FCP), meaning that they work with either SDR or HDR Library settings, in order to preserve the dynamic range of the source media:

From the FCP 10.6.6 User Guide:
"If the library is set to Wide Gamut HDR, camera LUTs preserve the full dynamic range of the log media. Depending on the source camera, these built-in camera LUTs also take into account metadata such as camera exposure index, ISO setting, and white balance."

A key thing in the above blurb that is missed by most everyone (talking about YouTube influencer types) is that any LUT is specifically designed for a given source color space, gamma, exposure index, ISO, and white balance setting. So, anything recorded "differently" makes using a LUT less precise.

A Bit Longer Answer
The built-in camera LUTs are nothing special. If you go to a camera maker's website, you should be able to download similar, if not the same, LUTs corresponding to anything bundled with FCP. You can use these downloaded LUTs in both places: Camera LUT and Custom LUT (effect).

Camera/Conversion/Technical LUTs are probably best applied at the end of the color processing chain (well, just before any final "look" LUT), so that they don't unnecessarily "throw away" any image data. In other words, not using a Camera LUT in the metadata field of the Info/Media Inspector helps prevent "LUT clipping" of image data.

By not applying LUTs until the end of the color processing pipeline (last effect in the Inspector), you preserve more source image data for processing and emulate what would be called a "scene-referred workflow" in FCP, rather than a display-referred workflow (i.e., using a Camera LUT).

Hope this helps...


Cheers.

P.S. - Ripple Training has a wonderful tutorial about using LUTs in FCP (I'm just a customer).

As you note Camera LUTs are best applied before a look LUT. That's my workflow. For that reason, I avoid using the Info Camera Lut features. I thought maybe there was a way to access the built-in LUTs (an academic exercise really) as I have the camera manufacturer's Camera Luts and can access those from Custom LUTs effect.

cseeman wrote:

As you note Camera LUTs are best applied before a look LUT. That's my workflow. For that reason, I avoid using the Info Camera Lut features. I thought maybe there was a way to access the built-in LUTs (an academic exercise really) as I have the camera manufacturer's Camera Luts and can access those from Custom LUTs effect.

What you download should be the same as what's bundled with FCP, though perhaps in a different format (which doesn't matter).

I guess you could download "camera" LUTs and apply them in the Camera LUT section and compare them to any of the corresponding built-in ones.

I do recall digging through FCP's application package and finding some binary versions of LUT files, but that was some time ago (and I don't remember where they were). Those files may have been in a non-standard format. I do recall that they weren't .cube or .mga formatted files, which is what FCP supports, as far as I know.