I was wondering if the RED (tm) team have concidered using a Didymium Glass like S-8801, Phillips 202, or the multi band Schott S-8817 or S-8817-A for the Sensor coverglass, and incorporating a XB29 like SPECTRAPLUS interference filter?
After looking at the sample image Haakon provided on his post that I processed a few days ago,
http://www.reduser.net/forum/attachm...6&d=1197105572
I began to wonder if the cover glass on the sensor could be re-desigined to improve the color purity, thereby reducing the need to computer masking of the colors to reduce crosstalk. As we all know, the better the orignal sensor data is, the less noise and artifacts you end up adding later with processing...
In addition to the enhanced Didymium Glass substrate, the RED (tm) team could contract to have the "Glen Spectra" XB29: Digital Imaging Filter applied to the sensor cover glass substrate (it has an IR filter) to cut the Yellow and Cyan wavelengths at 490nm and 600nm to give clearer colors. Since the XB29 has angle limits of about 30 degrees, the addition of the S-8817 glass will improve the color purification of wider angles of rays, that might help with ultra speed lenses like the Super Farron f/0.87 and the like...
Here is a link to information about the XB29 filter,
http://www.glenspectra.co.uk/glen/fi...ur_imaging.htm
and the Schott S-8817,
http://www.freepatentsonline.com/6612697.html
See the graph at the bottom (may have additional filtering).
Perhaps this could be offered as a step-up sensor?
Also if a blueish tint was added to the sensor cover glass the blue sensors could be run at reduced gain (after increasing the light passing through the lens) to bring down the Blue noise without over-exposing the red sensors and getting off balance white clipping.
Using the XB29 Yellow+Cyan cut filter may be a big help in getting better Blue or Green screen shots by rasing the contrast of the composite outline. Plain-Jane Didymium Glass mostly cuts the Yellow, whereas to get better Blue-Green seperation you need Cyan cut.
The XB29 seems to be covered with a U.S. Patent 5646781, but using its like on the Schott S-8817-A sensor cover glass may be able to qualify for a new Patent for the RED (tm) team?
It would be easer to have the filters on the sensor so that any size lens, 300mm or Zoom would not require large filters that cost too much to purchase...
Tests could be made with the filters in front of the lens, since the filters are too thick as they are to use behind the lenses probably... Anyone have a plain-Jane Rose Didymium Glass filter to try on their RED (tm) camera now (and post A/B frame caps)?
