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<span style="text-decoration:underline"> Cheap, filtered calibrations</span>
OK, to everyone trying out the cheap filter calibration with their PJ's, here's a brief explanation to clarify things. The first guys that I'm aware of to mention filter calibration for the AE700 are the chaps at cine4home.de and these guys actually know what they're doing.
The basic premise, was to use calibration measurements to find which of the different basic modes had the closest color accuracy to 6500k and which of the settings has the highest contrast ratio. Out of the box, Natural setting with -1 color temp had the closest measurements to 6500k and the Video mode had the best contrast, but Video mode's color turned in at about 10500k, way too high! That's why everything looks so blue, Dynamic is even worse. The difference in contrast was 950:1 for the Natural mode after proper calibration and 2050:1 for the video mode before calibration. They didn't bother to list the measurements for Dynamic because there were too many other problems with that mode i.e excessive sharpening, and the brighter the mode, the more the UHP lamp's deficiencies in the red spectrum are exacerbated.
The problem with video mode was that the measurements revealed that between about 20 IRE and 100 IRE, the red spectrum was deficient by about 48% and the blue spectrum was too strong by about 24%. Don't bother tweaking for color accuracy from 0 - 20IRE because that range is severely compromised. If you even out the color accuracy between 0-20IRE, the colors for the rest of the IRE range will be badly off.
Now the whole premise of filter calibration is to find a filter that evens out the SED as optimally as possible so that minimal digital tweaking of the settings is necessary. If you need to tweak the gamma and RGB settings a fair bit after placing the filter, you're going to end up losing most of the added contrast in the attempt to gain the color accuracy. In other words, you need a filter that can reduce the blue about 24% and increase red by about 48% relative to the green, so that additional diital adjustments are minimized, or optimally, not necessary at all.
I finally went ahead and ordered the Lee filters designer SwatchBook to see what their filters were like, so I could compare them for everyone who wants to try filter tweaking for free. The best thing about the filter swatchbook is that they have cards depicting the SED for each filter. After examining the SED for the varying filters, I picked out the ones that in theory should be closest to the ideal objectives listed above. I also tried the #109 Light Salmon filter. I don't know how it works with the Dynamic mode since I never tried using it, but I can tell you without a doubt, that the #109 is not good for Video mode. It is way too pink, and trying to remove that pinkness forces you to adjust the settings too much. If you do approximate the colors to 6500k, you will lose almost all the contrast gain from that mode.
That being said, the optimal filters for Video mode are #152 Pale Gold and #004 Medium Bastard Amber. I tried both, and with the Pale Gold filter, the attenuation was close to perfect. Very minimal changes needed to be made to use this filter and stay close to 6500k. That being said though, the Pale Gold is the lighter of the 2 filters with a transmission of 70.67%. After tweaking and comparing the 2, I chose the Medium Bastard Amber. The SED curves were fairly close and the Medium Bastard Amber has a transmission of 64.06% making it similar to using the Pale Gold with a ND filter. In other words, blacks are slightly deeper with the #004 filter.
Not having had the chance to check varying AE700 projectors, I can't definitively say what the SED differences will be bewteen PJ to PJ. I would guess that more of the differences lie with the bulbs than the PJs, meaning you would need to recalibrate and check measurements when you get a new bulb, and even when your current bulb starts getting older since the SED characteristics will most likely change. That being said though, with the general attenuation provided by these 2 filters, the end user should be able to make the last few adjustments to closely approximate 6500k. As mentioned before, for those who would like to try the filter tweak without having to do much in the adjustments and without the means to measure or calibrate, the Pale Gold filter will work best and will get you there with hardly any remaining tweaks required except to make sure the Brightness and Contrast settings are optimal. The Medium Bastard Amber needs a little more work, but will give better blacks, and for me, being used to viewing in the Natural mode, it's still a brighter picture.</div>
Un saludo <img src=https://www.mundodvd.com/forum/emoticons/hola.gif ALT="
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culto"> , si se pudiera hacer lo de mas arriba hasta me lo pensaba.