Originally Posted by scoobygt68
So over in the other JVC X30 (RS45) thread I seen someone mention that the lx1330b meter is capable of measuring not only lumens but also the contrast????? I would certainly like the ability to measure contrast in addition to lumen output.
All the meter measures is the strength of the light. I guess what coderguy meant is that the LX1330B can measure weaker light than the LX1010B. However, I don't think coderguy owns that meter, so I'd like to hear from someone who does own that meter:Is the resolution (minimum amount of lux measured) with the LX1330B, 1 lux or 0.1 lux?
I know with the LX1010B it is 1 lux. With the DT-1301 that I mentioned in post #7, the resolution is 0.1 lux.
But even 0.1 lux resolution may not be enough to measure contrast unless you "cheat" by holding the meter up right in front of the projector lens. Because a typical reading at the screen for a white field with a JVC would be 500 lux or less, and if the resolution is 0.1 lux, that gives you a maximum measurement of 500/0.1 = 5000 for the contrast. But the native contrast of the JVCs should be 50,000 or more.
I guess the best way to measure the native contrast would be to put the projector as close to the screen as you can while still being able to focus. This would obviously result in a ridiculously small picture, but it would increase the lux a great deal. If you could make the picture small enough to reach 50,000 lux on a white field, then even the LX1010B could measure a 50,000 to 1 native contrast ratio, albeit with large uncertainty since the dark measurement would be 1 lux +/- 0.5 lux. If you can make the picture small enough to get 150,000 lux on a white field, then the LX1330B should be able to make a decent native contrast measurement, I think.
Has anyone tried extremely-close projecting with JVC optics? What is the smallest picture that you can get in focus?