I wouldn’t be surprised if a lot of the effect is the effect on stray light - the iris places a narrow window in the light path so theoretically less oblique light rays that would bounce off the side of the light path would be allowed to pass. Could also be partly due to some added efficiency by the updated 3rd polarizer mentioned above ifIt’s more efficient and can reject more of this stray light - would make a lot of sense if they placed this on the green channel since it’s by far the highest intensity. May also mean that the improvement in adding the iris could be more pronounced if scatter is reduced to a less effective light path.. if you look at my last picture in the linked thread you can also see that there is a lot of light leakage out of the light path and into the chassis so it’s not as sealed/efficient as you’d think..Very interesting.
How wonder how that works.
- Adding the 2nd iris catches stray light that doesn't add significantly to brightness but does add significantly to CR, since the amount of light contributing to the black floor is many orders of magnitude less
- JVC grades the panels and picks better ones for the upper models
- Something related to however they got 100 L more (which is itself a head-scratcher)