Originally Posted by Craig Peer
I love great blacks, but not at the expense of all other picture qualities, which would be the case moving back to an RS640. Show me how you can run an RS640 on something like a 135" StudioTek 130 scope screen ( or say a even larger AT screen with less than unity gain, which many people have ) with 400 hours on the lamp watching 4K HDR and have a bright HDR picture without having the iris nearly wide open or completely wide open. I've had forum members over to see my RS4500 that own RS540's. Their comments have been " the blacks don't look any different in this scene than on my RS540 ". Laser dimming does work great - better than any mechanical iris I've had. And watching 4K HDR scope films now at 45+ foot lamberts on my screen has moved the bar even further from my old RS600 and VW600. Deep blacks are great, but anything under 18 foot lamberts for SDR and 35 foot lamberts for HDR is unacceptable IMO. Too dim.
I might find one scene every 10 or 15 movies where I wish I had the contrast of the RS640. I honestly think the shadow detail is better overall on the RS4500 than my RS600 though. So when I weight the pros and cons, the RS4500 wins every time - lower native contrast or not. John Wick 4 on 4K HDR, Deadpool 4K HDR, Star trek, Star Wars, they all look great. Hopefully the technology in the RS4500 trickles down to less expensive laser projectors in the future.
I need great blacks and if it's at the expense of most other features, then so be it. I'm not interested in HDR. So that helps a ton. I simply use MadVR and tone map all HDR to SDR so it still looks great, but doesn't require 1000 nits to do so. HDR on the RS4500 is probably good but nowhere near what it should be or what it looks like on an OLED TV. My RS500, before I sold it, had 3000 hours on the bulb, and it still looked like new. I measured it at 1270 lumens low lamp, 1750 high lamp, which is extremely close to spec on a new bulb. So the 400 hours in argument falls on deaf ears to me. Modern JVC bulbs at 400 hours are almost like new.
Again, if owners of RS540 or RS640's don't like pumping and turn off dynamic iris, then the RS4500 is going to be closer in blacks. I hear plenty of owners complaining about the pumping and recommending disabling the dynamic iris. This is not going to result in great blacks. But they don't care. These folks would find the RS4500 with its instant dimming acceptable. I find 1/2 second of fade out worth having a deep black screen so my iris is in full use. I can guarantee that the Interstellar scene on the RS4500 or with dynamic iris disabled on RS640 will be completely unacceptable for me. Also, you cited the "4K Blu-ray Interstellar Scene" above looking great. It doesn't. It can't because the 4K Blu-ray has raised blacks so you don't even get close to true black. So if that looks "great" to you, then we have completely different definitions of what are acceptable black levels - which makes sense.
Now, there's no way that a $15k JVC lamp based projector is going to provide all the Lumens and whatever else your RS4500 has going for it to do great HDR on a 130" scope screen. Whatever the situation will be, your RS4500 is going to be far better than what's offered as RS4xx, RS5xx, and RS6xx replacements. These are lamp based. Those that hate iris pumping are in for a "world of grey" when the native contrast cant get anywhere acceptable and it requires full on dynamic iris to get close to the current e-shift native blacks with full open iris. And by the way, if I want a machine that can do that, I already have my 675ES sitting here, not used for movies or TV because its blacks are too grey.