Originally Posted by conan48
Good to know.
At least it will be software related and not mechanical. Firmware updates could possible totally fix a botched initial program that is running the LEDs why to aggressive, not aggressive enough, etc. However a bad mechanical iris can never be fixed. The Epson iris is both very slow, and also makes noise like a coffee grinder, and many other iris i've seen produce noise as well.
The only iris i've liked has been the one is my Sony projectors (pearl, VW90, 50es) every other iris implementation was unusable for me (Optoma, Benq, Epson, Infocus)
Also, just curious why you are selling your NuVision? How does it compare to a top tier projector like a Sony, or JVC?
You have stated everything backwards. Just because it goes faster does not solve the problem, the problem is the smoothness of the response curve to how the peak white level in a given scene is affected in relation to the APL and gamma of the scene, and in relation to the next scene as the lighting changes from scene to scene and how our eyes interpret all these changes. This is going to be my technical response to your earlier remarks, because clearly some earlier comments were baiting trying to make it look like I had no understanding of what I was saying, yet I am very sure that I do have a very deep understanding of this topic...
Hence, it is the drops in the white levels, changes to APL and gamma, and the overall effect to the brightness of a scene that you see as being an annoyance to the eye, if this occurs too fast it will be noticed easier, not less. The better way to improve the issue is with higher native on/off. In order for any dynamic contrast to be able to match the effects of native On/Off (and hence BECOME native on/off), it would have to be as fast as the refresh rates, and I doubt the technology even in LED is that fast (but i know very little about LED, haven't cared much about it because no-one has really gotten it right under $10,000 yet).
I know what some are thinking about now, probably that Native on/off is technically a form of "faster" dynamic contrast since it is a measurement of a full white to black. For what we use the measurement for it is not, this is because in reality we are ONLY using Native On/Off as an indicator of how high the intrascene contrast will be in a low APL scene. If we had a standardized way to measure intrascene contrast in a low apl scene, then we wouldn't even ever measure Native On/off. So the reality of it is, that is why to match Native on/off, the technology would have to affect not just the levels in the scene, but the actual intrascene contrast of the scene (hence to do this it'd have to match the refresh rate itself on each individual pixel).
The best IRIS's are actually the slower programmed IRIS's that less often need to use the max speed. Even in the case of an instantly bright to dark scene, it takes our eyes a second to adjust so the key to the IRIS code is to try to match the NATURAL speed of how our eyes adjust to the picture in relation to how the lighting in the movie is changing. The reason we see jerkiness is because an IRIS responds too fast outside the optimal response curve as seen by the naked eye, or the mechanical nature of the IRIS lacks "smooth steps" so that you see it jerk even when making a small change. The Sony has both a smooth mechanical stepping IRIS, fast when it needs to be, and slow most of the time in its smoothness. The entire trick to programming an IRIS is to make it respond SLOWLY and smoothly to the Gamma + APL derivative so that you do not need to use the SPEED of it. If you allow the IRIS to positionally jump around from MAX to MIN too much, then that means it is violating a smooth curve and that is not the result you need.
The Sony (most of the time) is one of the slowest reacting IRIS's except in the case of a severe APL change when it needs to go faster, and that's why it is so hard to see, hence the reason the Sony can still work and still be slow is because the derivative based on the APL and Gamma is more naturally matched up to its response curve over time to keep it hidden from our eyes without needing it to JERK itself. The reason the Epson appears to be slow is because it is "driving too close to the edge" - so to speak. Other IRIS's are like hacked up code that are re-calibrating in the middle of an APL change.
In general it is usually a software problem. I don't know about LED dimming techniques though, but even if it has SUPER SPEED, it doesn't change the fact that ANY dimming technology drops the PEAK white level, and that is the annoying effect we see by eye.