Steve Smallcombe has developed a spreadsheet for maximizing the contrast and black level of the 10ht. The idea is to build a detector using a photoresistor and multimeter. By using the color filters that come with Avia a profile is made at different IRE levels and the gain and bias settings are adjusted to maximize the contrast and black levels while maintaining the correct color temp.
The 10ht's bulb doesn't produce as much red as green and blue and the CC filter acts to attenuate the green and blue while allowing all the red through. This further increases the black level while maintaining/increasing the contrast.
Steve's web site explains it all better than I can so go here to get more information.
I'm in the process of setting my 10HT up with the filter, my contrast ratio was 150:1 at the start and is now hovering around the 480:1 mark with the filter on, but not recalibrated. I haven't done any critical viewing yet but the improvement is very obvious.
The difference in this case is that the filter is part of a package that maintains the correct color balance - whilst significantly improving black levels. The spreadsheet in fact recommends the type of filter for the 10ht - CC20R, CC30R or CC40R depending on the individual projector. It is an objective rather than subjective process that produces measurable results.
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