Originally Posted by microwiz
I agree you could never load NX7 do that but even if you could do what you are suggesting it doesn't change the native contrast, only the dynamic contrast.
So it will never be a NX5 even iwth the hack.
It's changing the actual native contrast. You are not understanding, it's not a mechanical thing that is done, it's a piece of plastic that stops light from leaking into the light path. Its before the lens, that's why it affects native contrast. Anyhow, dynamic contrast means a mechanical device. A fixed aperture either affects ANSI, Native, or just reduces light output. However, you can trade lumens for higher contrast by blocking the lumens before it gets into the light path with this piece of plastic. I always knew this was theoretically possible, just didn't realize where to put the piece of plastic to block the light until someone reverse engineered it.
However, it isn't exactly like the next model up, since it's still missing some features and firmware, but contrast wise it would be closer. Again, I've never tried it myself and never measured, so I do not know the net benefit, but this info comes from someone that had opened up several JVC's and reverse engineered how the increase in the native was done. Also, the native JVC implementation is going to be more advanced using optical tricks as to lose less light when adding it most likely. However, the NX series are so bright that there is so many lumens to spare, you could probably increase contrast quite a bit if you can do it correctly.
JVC purposefully handicaps the lower-end JVC's by removing a piece of plastic to let light escape, or you could say by leaving a gap in the manufactured area.
It literally is supposedly the same part that JVC adds between the RS-4xx to 5xx to 6xx.