Originally Posted by noah katz
"Originally Posted by wse View Post
Any one tried the 4910 yet? I can get a used RS66 or the 4910 for the same price which one should I choose?"
And possibly the DI on the 4910 will allow it to effectively surpass the CR/blacks of any previous model.
It is very important to categorise that a little as DI is a new concept for previous JVC owners. If you consider the 4910, the native contrast is only slightly improved over the 4810. If there is a night city scene with skyscapers with lots of lights on in the buildings, the only thing a DI will give you is optimising what the peak light output is for that specific scene, but the actual contrast while specifically watching that scene remains unchanged.
Or consider this in another way...what benefit do you think a DI provides? The big hope that we had as JVC users, is that the DI would focus on better blacks. Well it does do this, but we don't know how much more the DI moves from its smallest manual setting (-15). So fi you pin the aperture manually to -15, how much smaller will the DI go and how much more contrast will that give you. If -15 already gives you 14ftL and you don't want it any brighter than 14ftL, then the only boost you will get will be that difference between -15 and true minimum. It may be a very small difference. If for your screensize and screen material gain, that you need -10 on the aperture adjustment to hit 14ftL, then the DI will be working over a larger range. The larger range it operates over, the greater the dynamic contrast becomes, but the actual contrast range exposed in any specific scene remains the same. The perceived change from light to dark scenes increases however, as does the risk of side effects and influences on gamma accuracy.
On Sony projectors the importance of a DI Is clear due to the limited native contrast. On JVCs its benefit is more difficult to ascertain. To me the main benefit is the fact the aperture can go smaller than -15, but nobody has measured by how much. I will be VERY interested to know about this once it gets into the hands of those with measuring equipment. You see, I normally aim for 12-13ftL. As I watch in complete blackness, I find anything higher really makes my eyes squint if it goes from a dark indoor scene to outdoors. I find that very uncomfortable it if it happens repeatedly in the movie. So my aperture on my X75 is set to -13. The X76 is brighter by 100 lumens than the X75, so I would probably gain further in native contrast by being able to close down all the way perhaps. But then the only benefit of the DI would be where it goes smaller than -15. I know of quite a lot of other JVC enthusiasts who also have their aperture set to the minimum.....