You mean that it can be bough for 15 EUR at certain URL.

Can you explain why someone need to buy LUT?

What exact camera settings are fixed at J-Log1 to allow any meaningful LUT usage?

LUT is developed to bring the camera's recorded image to a standard, Rec709 baseline image that retains all the dynamic range while fixing any colour errors and minimising noise. This LUT is also designed to make the image feel as filmic as possible within the Rec709 parameters. In other words, the intent is not only to make a proper Rec709 output, but have it feel closer to celluloid film than a harsh video output

I also have issue with this marketing statements.

The downloadable LUT package provided by JVC for the LS300 fails to provide a high quality conversion of J-Log1 footage into REC 709 color space. The results JVC's LUT produces are so over-saturated that I found it useless as a starting point for further grading of J-Log1 footage.

It means that you can show measurements of color difference using standard charts between build in LUT / rec 709 ideal and yours?

@LPowell This is v probably me but I'm not seeing much difference to pulling it down under 75 then applying JVC lut, is it doing something else, I'm sure it is and I'm just not seeing it.

No, that would require proprietary technical documentation of the sensor colorimetry and J-Log1 tone curve used in the LS300, which JVC has not disclosed.

This one I do not get, I asked for final image measurements and comparison.

What we can do is to shoot footage of industry-standard color charts (e.g. X-rite) and calibrate those images to Rec 709 standards. That is what enables us to match both LS300 and GH4 footage independently of manufacturer specifications

Cool, this is close to that I ask.

Can we see color difference measurements between standard JVC LUT, ideal image (math), and your LUT usage result. All on standard chart.

Here is a sample video showing the LS300 Leeming LUT in action. The video begins with uncorrected J-Log1 footage, and uses a screen wipe to apply the Leeming LUT. This video was shot with a fast shutter speed in order to eliminate motion blur.

My experience with J-Log1 exposure is reflected in the instructions that accompany the LS300 Leeming LUT. I use the histogram to gauge the best ETTR balance of highlights versus shadows, and the zebra (set at 100%) to show which highlights fall in the superwhite exposure range (100-108%). I abandoned the camera's spot meter after finding its percentage readings (up to "800%" in J-Log1 mode) provided no reliable indication of where highlights begin to blow out.

While the J-Log1 gamma curve is not as extreme (i.e. retains moderate contrast levels) as the log profiles in other cameras, it is quite flat throughout most of the IRE scale. This makes the Leeming LUT work consistently across a wide range of exposure levels. The J-Log1 curve does appear to roll off a bit in the superwhite region, so for the finest highlight detail, I'd recommend exposing below the zebra threshold.

@belfryman Make sure your video editor properly recovers highlights in the superwhite (100-108%) range. LS300 footage is interpreted as Rec 709 studio swing video (i.e. 8-bit 16-235), even though J-Log1 records highlight details beyond 100% white. In Adobe After Effects, I often reduce luma gain to 91% in order to recover the superwhite highlights.

@LPowell Success! I don't know what was going on with the 100% clipping but I am now getting footage that isn't clipped at 100% now. I finally sussed out the histogram, cos not needed to set it myself before, used the zebras to set the histogram to. Now I think I have something where I know pretty much what's going on exposure wise. It's a bit difficult to tread the line between the 100 and 108 without risking blowing out because the histogram is so small on the LCD and I bought a 2nd hand zacuto evf pro which has no histogram at all, so I'm going to pretty much leave the 100-108 as error margin territory, and work off the zebras on the zacuto which are matching well with the on camera. I think I may now be safe to shoot j-log and just pop on your lut and good to go. I hope!

nm, wrong topic.

No, I had posted in the wrong topic.

@DrDave That was a clueless test of what happens when you misuse a video camera, but it did show how bulletproof the LS300 is. In Jlog-1 mode, it defaults to ISO 800, but can be set as low as ISO 400, so 3200 isn't that bad. In practice, ISO 1600 is the max I'd recommend, assuming you're prepared to use NeatVideo on it. But with GH2 and GH4, ISO 800 is all you can reasonably expect.