dabateman Posted October 29, 2018 Share Posted October 29, 2018 I just found some interesting plots for the CFA dyes that can be purchased from Fuji.See here:https://www.fujifilmusa.com/products/semiconductor_materials/image-sensor-color-mosaic/index.html The standard RGB spectrum for our sensors that we know. The plot includes CFA layer thickness.https://www.fujifilmusa.com/products/semiconductor_materials/image-sensor-color-mosaic/rgb/img/index/pic_02.png However look at this plot for the CMY filter dyes. https://www.fujifilmusa.com/products/semiconductor_materials/image-sensor-color-mosaic/cmy/img/index/pic_02.png That 70% transmission under 400nm for Magenta and Cyan dyes. A sensor with this CFA would be very sensitive to uv. I didn't know they made these dyes for sensors, nor have I ever seen this talked about. Has anyone ever seen a CMY sensor? According to Wikipedia, the last consumer CMGY camera was the Nikon coolpix 5700, from 2002. Sensors with CYYk were used in Kodak 620 and 720 DSLRs. Link to comment
Andy Perrin Posted October 29, 2018 Share Posted October 29, 2018 https://en.m.wikipedia.org/wiki/CYYM_filter Link to comment
colinbm Posted October 29, 2018 Share Posted October 29, 2018 https://en.wikipedia.org/wiki/CYGM_filter Link to comment
JMC Posted October 29, 2018 Share Posted October 29, 2018 I just found some interesting plots for the CFA dyes that can be purchased from Fuji.See here:https://www.fujifilm...saic/index.html The standard RGB spectrum for our sensors that we know. The plot includes CFA layer thickness.https://www.fujifilm...ndex/pic_02.png There's a paper with the information on visible light transmission here; http://www.imagesensors.org/Past%20Workshops/2011%20Workshop/2011%20Papers/I01_Taguchi_ColorFilter.pdf Link to comment
dabateman Posted October 29, 2018 Author Share Posted October 29, 2018 I am sorry I wasn't clear. I knew of those cameras from 2002. But If Fiji still makes this dye, up to version 4, and stocks it and sells it. Someone must be buying it recently fir a CMOS chip. Maybe its a security camera or a backup car camera. I am just surprised that it hasn't shown up in a known full spectrum camera. Link to comment
dabateman Posted October 29, 2018 Author Share Posted October 29, 2018 There's a paper with the information on visible light transmission here; http://www.imagesensors.org/Past%20Workshops/2011%20Workshop/2011%20Papers/I01_Taguchi_ColorFilter.pdf Jonathan,Thank you, that paper was interesting. Highlights the need for thinner better CFA layers as the pixel droped below 1.7 and higher transmission efficiencies are required below 1.4 um. However, I am still curious in the timing. Then last commercial known cameras with CMY were made back in 2002, around the birth into digital photography. Fuji currently selling CMY dyes for CMOS sensors are then either in cameras I just don't know or are being redeveloped to solve the transmission problem for car back up cameras and phone cameras. Still surprised over the bunch of specific full spectrum cameras on the market, CMY wasn't marketed as a major selling point or even used. Maybe just cheaper for Fuji with there models to just remove the block filter than use a totally different dye that they even knew would be better. I am thinking of the Fuji XT1 IR and Fuji IS pro forensics cameras. Link to comment
JMC Posted October 29, 2018 Share Posted October 29, 2018 David, another paper - comparison of a RGB and CYGM sensor down to 300nm!! https://core.ac.uk/download/pdf/19530873.pdf Link to comment
dabateman Posted October 29, 2018 Author Share Posted October 29, 2018 Wow that CYGM sensor would have about 3 stops more UV gathering potential than the RGgB we use! At least above 350nm.Too bad no one has used that dye configuration in a recent SLR. Link to comment
dabateman Posted September 4, 2019 Author Share Posted September 4, 2019 I found a new one, however its a very small 1/2 inch sensor but looks to have a c-mount. Its the Lodestar X2C guide camera.Has 795 x 596 (0.47 MP) sensor with 8.4 micron pixels. The sensitivity is interesting: Link to comment
Andy Perrin Posted September 4, 2019 Share Posted September 4, 2019 I could probably simulate this with bandpass filters on the Triwave. Link to comment
dabateman Posted September 4, 2019 Author Share Posted September 4, 2019 Andy,Your discussion on LAB color space got me to think about CYGM sensors again. With our RGGB sensors in Deeper UV only the Red and green colors are sensitive and at around 2%. Whereas in a CYGM sensor the magenta and yellow colors are sensitive. At much higher levels. Link to comment
dabateman Posted September 4, 2019 Author Share Posted September 4, 2019 Here are some optimistic snap shots comparimg RGGB vs CYGM sensors: Link to comment
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