AVS Forum Special Member
Join Date: Jul 2000
Location: within the unlimited boundries of my imagination
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The one thing that has bothered me about moving from my NEC XG's to these Ampros has been their ability to make true Red.
Both, the Ampros and the Barcos have a hard time doing it...you get some true Reds and the "fringe" reds push to orange.
I recently bought a filter that was supposed to take care of this, considering what it was and what it actually did, the price was very high...and when holding it up in front of my Red lense while showing my "red reference" discs, it helped only slightly, not even close to what the NEC's can do. However I installed it anyway...as luck would have it, the installation didn't hold, it started to pull away from the back of the lense due to the convex natural of the rear lense, and I was able to send it back.
The next day I set out on my quest to understand filtering and remedy this problem, several phone calls and three trips to different shops I had the answers!
I learned that the Amber filter I had recently tried worked in approx the 575 nanometer range and above...what was really needed was a filter that worked almost like a squarewave, and worked from approx 675 to 725 NM range...this little bit of Red Heaven is called Roscolux #19.
Its rises very fast at 640 NM, then decays very fast at approx 730 NM.
I brought it home and held a piece up to the red lense while viewing my Red ref's...HOCUS POCUS, it worked perfectly!!!
The Toy Story 2 intro logo is now Red with a hint of orange (as it should be) instead of orange with a hint of red...the red coats in the Patriot are Red instead of red with orange highlights...and Moulin Rouge looks amazing again!
The install was simply, but must be done with care...simply remove the red lense, cut the filter to fit 1/4" into the "black frame" area that's around the tube face, then cut duct tape into 1/2" strips, install tape on filter material so 1/4" is adhered to the filter material (using wax paper under the filter to keep tape from sticking to work surface), and install filter on the tube face working from the center out.
Lastly use a soft cloth to smooth the filter out against the tube face.
Reinstall the the lense.
After finishing I did a grayscale check using our CA-1 colorimeter...strangely enough, sub-brightness had to be turned DOWN one notch? Then sub-contrast was increased by two notches...not bad at all.
All I can say is amazing, Fleshtones are more realistic, being tinted more toward red/pink than orange, unless it's a movie like "From Hell" which is supposed to have a bit of an orange tint, then it's there. True Oranges and Yellows are uneffected (as in 5th Element)
All this at a friction of the cost!
If you want to try this, and don't want to spend the time trying to find this filter material, let me know, I have plenty to spare.
My Reds are now close enough to the NEC XG's that it's a none issue!