Oh and it’s probably just the internal timer. Reset the lamp clock (while jotting down the total hrs) and your light will most likely go green again.The bulb/lamp light on my unit just turned orange today. The projector is around 3500hrs. I've only used it on low mode, so I thought I had another 1000 hours to go. Should I change the bulb immediately, or do I have more time? The picture still looks fine.
If you are tone mapping HDR into SDR you will not need the curves. I think you need to put the projector in the correct expanded color mode but it’s been a while since I have messed with it.
That's correct, if tone mapping from HDR to SDR you don't need the custom gamma curves as you just use the standard SDR gamma but set the color profile to BT.2020 instead of the normal one to take advantage of the expanded color space.If you are tone mapping HDR into SDR you will not need the curves. I think you need to put the projector in the correct expanded color mode but it’s been a while since I have messed with it.
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No problem! Honestly the second Iris made a pretty substantial difference I think so if anyone is interested in tinkering with their machine I think its potentially worthwhile - I wouldn't be surprised if it bridges a lot of the gap in performance between the RS420 and RS520 although the caveat is that I have not seen a RS520 in person. The original google doc posted by the thread starter is great, and I took a bunch of pics and added commentary to explain them all as well to further document the process. Took a few hours and only about $15 in materials to do..^ Interesting, thanks for the link!
I unfortunately do not have a colorimeter so don't have absolute numbers for you. Subjectively there wasn't much decrease in output (atom, the thread starter from a couple years ago claimed about 20% reduction however I wouldn't have pegged it at that high), and the increase in contrast was substantial - easily seen in darker scenes - I rewatched the end of the recent Wandavision episode 6 and the scene with Vision flying over the town and the contrast was subjectively substantially improved. I historically had a CRT projector, and the baseline contrast on the RS420 was a little lacking in my estimation although I still thought the overall image was great. Note that the addition of the second Iris in the location documented in that thread is one of the main ways that the additional contrast has been obtained between the base model JVCs and the mid tiers for several projector generations, which remains true in the RS420.What was the improvement in CR and brightness reduction?
Interesting to know - also implies that suppression of more light by a more restrictive second Iris might further improve contrast. I'm pretty happy with how it is currently and don't feel a tonne of need to test multiple Iris configurations at this stage, but would be an interesting experiment..What they don't mention and has been pointed out by many is that the 3X CR increase comes at a high lumen cost.
So your results are interesting.
I haven’t found that to be the case. My two RS500 are just as bright, if not brighter, than my RS400.What they don't mention and has been pointed out by many is that the 3X CR increase comes at a high lumen cost.
So your results are interesting.
I haven’t found that to be the case. My two RS500 are just as bright, if not brighter, than my RS400.
I used the same lamp for the comparison.Are you saying with the 2nd iris closed on the 500's they're just as bright as the 400?
And with much higher CR?
Either way, an unknown variable here is lamp variability, unless you checked that by switching them.
Does that include the 400 at max brightness?When adjusted for the same luminance e, the RS500 consistently has higher contrast.
Yes, the contrast advantage is noticeable even with the iris wide open.OK good; very interesting.
Since there's a tradeoff between CR and brightness, I think of a pj's figure of merit as their product, so the 2nd iris improves it.
However, I'm not sure it invalidates the point which I didn't quite finish making:
If you value brightness over contrast, you won't want to use the 2nd iris.
Does that include the 400 at max brightness?
If so, I rest your case