Beginner needs help. two specific issues!?

Hi, first I would say that I really enjoy using Davici Resolve and learning stuff about colorgrading.

I have spent countless of hours on the internet trying to find information and answers on to specific things.

Number one.
I think I do something wrong because when I add Resolves build in film look 3dLut ( Rec709 Kodak 2383 D55 ) and some other LUTs as well.
The image starts to act weird on the scope and I can´t bring it over like 830. On the parts of the image that is clipping there occur some weird blue/red color generated. What might be wrong? I add the LUT in the following way: Right click on the node - LUTs - 3D LUT - Film Looks - Rec709 Kodak 2383 D55.

Here are some pictures: for this project I use Sony 8bit S-log2

Number two.
When I had graded the first half of my project I realized that “Use Optimized Media If Available” was ticked… Is Resolve automatically switching to the source files when I´m color grading in the color tap? Or how does it work?
Otherwise have I then graded my Optimized files? When I toggle on/off “Use Optimized Media If Available” I can´t tell any difference on image or the scope.
I also wonder how “Render Cache” and “Proxy Mode” effect the image/quality in the color tap?

Best ragards Olle Olsson Sweden. I use Davinci Resolve 15

Anyone that can help me? I would be very thankful. I don´t know where else I would get support with this!?
I want Davinci Resolve to be fun and interesting not frustrating.

1) use of the Kodak print film emulation LUTs can skew levels, particularly highlights, way out of bounds. Put the LUT on a latter node, then bring the highlights down, and perform other adjustments as needed, in a prior node.

2) if you have "use Optimized Media if available" checked, then your grades are applied to the optimized media. Uncheck it, and the grade you see is applied to the source media. You may or may not note any difference, depending in part on whether any "out of bounds data" was (or wasn't) retained in the optimized media.

The image starts to act weird on the scope and I can't bring it over like 830. On the parts of the image that is clipping there occur some weird blue/red color generated. What might be wrong?

There are a lot of reasons I try to avoid LUTs whenever possible, and high on that list is "destruction of highlights and shadows." I honestly believe that most of the time -- admittedly, not 100% of the time -- you can duplicate 90% of the look of the LUT just using the controls already in Resolve. Sometimes, putting a node in front of the LUT and behind the LUT and adjusting the levels can tame the LUT to a point. (And I credit Patrick Inhofer of MixingLight.com for that tip some years ago.)

Don't assume that just because something says it's going to give you a print LUT that a) it's going to look like film, b) there aren't drawbacks with it, and c) your footage is shot in a way that will work with the LUTs. LUTs tend to look different depending on what kind of material you throw it on.

My suggestion: grab a still of the image with the LUT (at least a shot where the look is pleasing). Now remove the LUT and create a series of nodes where you adjust the image, optimize the levels, and manually use curves and lift/gamma/gain to match the look on scopes and on a calibrated display. There's more to it than that -- I tend to start with Printer Lights, then a Custom Curve for contrast, but after that it's mostly fairly simple LGG controls. Generally, I can get there. With Resolve 17 and the new HDR/Zone Grading controls, plus Color Warper, I suspect that will get you even closer to exactly matching all the benefits of the LUT's look with none of the drawbacks.

thanks a lot for the support guys.

The image starts to act weird on the scope and I can't bring it over like 830. On the parts of the image that is clipping there occur some weird blue/red color generated. What might be wrong?

There are a lot of reasons I try to avoid LUTs whenever possible, and high on that list is "destruction of highlights and shadows." I honestly believe that most of the time -- admittedly, not 100% of the time -- you can duplicate 90% of the look of the LUT just using the controls already in Resolve. Sometimes, putting a node in front of the LUT and behind the LUT and adjusting the levels can tame the LUT to a point. (And I credit Patrick Inhofer of MixingLight.com for that tip some years ago.)

Don't assume that just because something says it's going to give you a print LUT that a) it's going to look like film, b) there aren't drawbacks with it, and c) your footage is shot in a way that will work with the LUTs. LUTs tend to look different depending on what kind of material you throw it on.

My suggestion: grab a still of the image with the LUT (at least a shot where the look is pleasing). Now remove the LUT and create a series of nodes where you adjust the image, optimize the levels, and manually use curves and lift/gamma/gain to match the look on scopes and on a calibrated display. There's more to it than that -- I tend to start with Printer Lights, then a Custom Curve for contrast, but after that it's mostly fairly simple LGG controls. Generally, I can get there. With Resolve 17 and the new HDR/Zone Grading controls, plus Color Warper, I suspect that will get you even closer to exactly matching all the benefits of the LUT's look with none of the drawbacks.

Okey. I did my own replica of the look but it was very frustrating that I didn't know what was going on with the image. I thought I did something the wrong way. Now I know that luts can bring some random drawbacks.

1) use of the Kodak print film emulation LUTs can skew levels, particularly highlights, way out of bounds. Put the LUT on a latter node, then bring the highlights down, and perform other adjustments as needed, in a prior node.

2) if you have "use Optimized Media if available" checked, then your grades are applied to the optimized media. Uncheck it, and the grade you see is applied to the source media. You may or may not note any difference, depending in part on whether any "out of bounds data" was (or wasn't) retained in the optimized media.

This is my own personal project so if I´m pleased with the graded images after I have unchecked "use Optimized Media if available" then it´s fine. Right?