Originally Posted by Javs
Have you ever totally zoomed your RS500 in so the frame is tiny on your screen? I did this the other day when I was measuring my contrast, and I was pretty surprised to see SIGNIFICANT light bleeding WAY outside the outer edge of the image.
I am not talking about just a halo bar around the frame a few inches, I'm talking huge light bleed bars about 30% further outside the frame of the picture. No matter which Iris position, they still were there, and its coming from well inside the lense,
Even though my RS400 is back in it's box for now (waiting on a room), this is something I noticed as well, while I was performing initial testing. My purpose was to check out how variable-sized images looked in a CIA configuration, and the light bleed bars seemed like a real anomaly. From what I was seeing, it would mandate corresponding masking to eliminate them. And to be clear, I'm not talking about masking any letterbox or pillarbox areas within
the resized 16:9 frame. I mean the area outside
that box, once the active image has been shrunken down. I really wasn't expecting this, and was unsure if it might just be my specific unit.
...since I stood in the patch of one of these light bleeds and looked back into the lens and moved my head from side to side, and sure enough it got brighter and darker as I did it, so I am not sure what this could be. Its quite alarming. JVC really need to sort out the internal reflections and light bleed.
I didn't do this, but I was testing on a blank white wall, and just moved my hand around the periphery. So not as illuminating a test as you performed.
This would make any stacking and edge matching impossible, would totally destroy your ANSI contrast it was that bad.
I think this is a consideration very few are aware of at this point. I don't recall anyone besides yourself ever mentioning this before. Presumably because it's simply not a factor for most people. But for me it seemed to indicate that adaptive/variable masking would be a requirement for a CIA configuration (not simply a bonus, or improvement). I was kind of hoping I was overlooking something*, but your comments tend to confirm my initial observations.
[* mostly because no one actually doing a CIA/VIS setup, such as
for example, had ever commented on this. Granted, he does have variable masking, and likely always utilizes it.]