mjm6
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What did you do for color balance to establish the differences? Did you note what LR shows as the color balance of the various shots, and did you lock it down to see the delta from one to the next?
In my opinion, the most important thing about these filters isn't whether there is a slight (or maybe even somewhat substantial) color shift as long as the shift is relatively comparable across the spectrum so that the overall relationship of colors to each other remains constant and visually comparable.
If that is the case, even with a shift in color, you can apply color balance and bring the colors back to a relatively reasonable place.
To test this, I suggest you take the four images and do an eyedropper color balance on the white card that it appears you placed on the light stand. Use a pixel averaging selection (in PS you can do this, I don't recall if LR allows an averaged selection). Then, do the exact same color balance on the exact same place on the other images and then compare. Make a note of the color temperature and the tint settings. Then, look at what has happened to the various colors in the image relative to each other, and decide which one looks the most natural. This would be a lot easier to do if you included a Macbeth color chart, because when comparing directly, the differences will pop out to you; some colors will be suppressed, others enhanced, and the relative relationships can be assessed.
Some of the older ones (Lee and Formatt from years ago now) had considerable near-IR leakage and that really messed with the color relationships of some of the spectrum. The bottom two look quite good, and even the Lee might actually look fine once color balanced (but it's impossible to see that without actually the adjustments).
Lastly, I think the Polar Pro benefits from being a slightly bit higher in exposure. Normalize for that and the bottom two might be almost identical. There's plenty of room for minor adjustments in LR when the difference are that small.
I've not tried a Polar Pro, but the Breakthrough filters I have are really superb. Much better than the Formatt ones (and Lee apparently, but i haven't used one of those).
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. I'm probably on my 3rd or 4th Big Stopper, but I think this will be the last!