Originally Posted by Javs
Its both that and dust blob. I've otherwise measured 220:1 in an area less affected. It seems it's heaps affected by lens shift too as per Ekkis video. You could probably shift the issue out of view. Dead centre is probably the worst. Looks like shelf mount down low or ceiling mount very high would be best
That's a double-edged sword though...
Whilst you might improve the ghosting by using a lot more vertical lens shift, you would be potentially worsening the image due to the worsening the RGB convergence, as well as focus uniformity / smearing / streaking / flaring etc., which transpires as a consequence of significantly increasing the lens shift. So we need to be careful to weigh up both the postives and negatives of using large amounts of lens shift, and whether the overall net video performance with actual video content is better or worse.
Where I think you will be more likely to see a degradation with video content with worsened RGB convergence plus worse focus uniformity / smearing / streaking / flaring etc. than you will with respect to ghosting that is hardly visible with test patterns and let alone actual video content. So it boils down to how bad is the ghosting and whether or not you can see it with video content.
With the JVC RS4500/Z1 I have here you can only really see the phenomenon when looking at the lens itself, because with the test patterns you can hardly see the ghosting if at all, and no way will this show up in actual video content. Whereas, Ekki is reporting that with respect to his N5 it is so bad that you can very much see it with video content.
So as long as you cannot see it with actual video content then I think you are better off not
jacking up the vertical lens shift to get rid of the ghosting. Where in such instances really the only negative impact is with respect to the higher ADL contrast peformance being lower, including ANSI (50% ADL), as compared with other makes and models of projectors that have less internal reflections and light scatter within the optical block and lens
Originally Posted by Javs
I'm just saying you guys are highlighting things that have been there for generations. Its not a defect. Well, it is, but it would affect almost all of them.
Yes, I agree that this is clearly a pre-existing issue that currently affects all JVC projectors, which is clearly why they typically measure lower ANSI versus other makes and models of projectors that have much less internal reflections and light scatter.
JVC has now confirmed that my RS2000/N7 is definitely defective; however, they are going to meet with me next Thursday and we will evaluate my initial JVC RS3000/NX9 unit together. Wherein, the primary issue I have with it is that the ghosting is so severe to the extent that the contrast is measuring below what I consider should be acceptable tolerance range, in that the ANSI measures only 150:1. So it is going to be interesting to see whether JVC accepts this as being a defective unit or comes back stating that this is within the expected range...