Short answer is, they are the same level of IR filter as the G2 and I find that adequate for me and use them as is all the time.
It's more accurate to call them "full spectrum" ND filters. They aren't specifically IR cut, it's just that like with most modern ND filter formulas, they talk about cutting IR as much as they cut visible light.
So Arri for example now have FSND or Full Spectrum Neutral Density Filters.
https://www.arri.com/en/company/press/p ... nal-filterThey aren't IRND filters per se, they just now equally cut IR with visible.
This language reflects a bit of a philosophical difference.
What USED to happen with ND filters in the film days is that the visible light was cut BUT, the IR wasn't affected. Film didn't really react so it don't matter AND the light levels meant 1.2 was almost the heaviest ND you'd ever need.
A heavier the visible light cut, like say a 1.8ND of 6 stops, would have the same amount of IR light as a 0.6 2 stop ND filter. They would reduce the ratio of visible to IR.
When those types of filters are used with digital cameras that have sensors that to VARYING degrees are sensitive to IR, there is more IR compared to visible RELATIVELY speaking, so when you use heavier ND's it APPEARS that the IR is terrible compared to a ND6. It's actually the same amount, just that when you reduce the visible light the IR now affects the image more.
Now most modern ND filters are starting to be designed not to be IR cut, but to be full spectrum, therefore, cutting IR equally to the visible light.
Hoya Pro, NISI Lee CinePro, Mitomo TrueND are all similar full spectrum designs.
Seperate to that is the choice some camera makers have about how much IR to eliminate from their sensors with the sensor stack.
BMD have traditionally used a more mild IR cut, with the logic being that you actually don't want all your IR cut where it's so aggressive it affects your colour science and eliminates visible red that you want, something that can effect skin tones. Some early IR filters on Alexa for example made everyone green, which is kind of solving one problem, by introducing another.
Anyway, if you're happy with the IR cut the G2 filters have then these are the same in the P6K. I personally don't feel the need for additional IR cut. Some people MIGHT, but it's not going to be readily visible even in worse case scenarios. We're now talking very subtle differences in small degrees of difference.
JB