It’s very easy to create your own User3D LUT for the Sony PXW-FS7 using DaVinci Resolve or just about any grading software with LUT export capability. The LUT should be a 17x17x17 or 33x33x33 .cube LUT (this is what Resolve creates by default).
Simply shoot a correctly exposed Slog3 clip at the native ISO. You must use the same Gamut as you intend to use in any other productions that will use this LUT, I recommend SGamut3.cine.
Import the clip in to Resolve and grade it as you wish the final image to look. A very good way to do this is to include a MacBeth chart or DSC Labs OneShot or CDM chart within the test shot. Then use Resolves excellent chart matching tool to get create a starting point for the grade. The big benefit of this approach is that Resolve will provide a very good gamma correction moving your footage from Slog3 to Rec-709. Once you have used the chart to move you into the correct gamma range just tweak and fine tune the image to get your desired look. Then once your happy with your look, right click on the clip in the timeline and “Export LUT”. Resolve will then create a .cube LUT.
Then place the .cube LUT file created by the grading software on an SD card in the PMWF55_F5 folder. You may need to create the following folder structure on the SD card, so first you have a PRIVATE folder, in that there is a SONY folder and so on.
Put the SD card in the camera, then go to the File menu and go to “Monitor 3D LUT” and select “Load SD Card”. The camera will offer you a 1 to 4 destination memory selection, choose 1,2,3 or 4, this is the location where the LUT will be saved. You should then be presented with a list of all the LUT’s on the SD card. Select your chosen LUT to save it from the SD card to the camera.
Once loaded in to the camera when you choose 3D User LUT’s you can select between user LUT memory 1,2,3 or 4. Your LUT will be in the memory you selected when you copied the LUT from the SD card to the camera.
NOTE: If you use a Mac to copy the LUT to the SD card the Mac will place some junk files on the SD card with almost exactly the same name as the LUT. The camera will see this junk file and display it in the list of LUT files. The junk file will have a “._” before the LUT name. Don’t try to load these junk files by mistake, they won’t work. Make sure you scroll down the LUT list to the real LUT file when you try to load the LUT’s in to the camera.