Valentine Day provides a chance to get a good red filter. The candies are wrapped with a red plastic. The price is cheap. In a couple of days, after the holiday, the price will be less. I checked the wrapping with a crude spectrometer. The darker shade is VERY red. So what? You can use a piece of it to check your safelight to see if any red is there. If you see it, so does your holographic film.
Colin Kaminski - Wed, Mar 28, 01 12:14:11 AM
Don't forget your theatrical lighting supply for cheap colored filters. Roscolux samples show the attenuation curve of every color available. I use #90 Dark Yellow Green as a safe light in a mini mag light for emergencies. 13% transmission with a 22% peak at 520nm and <2% transmission at 580nm. A good red filter is #27 Medium Red with 4% transmission with a 75% peak at 680nm and 0% transmission below 585nm. Look in your yellow pages under theatrical supply. 64.167.150.183
John Klayer - Thu, Mar 29, 01 07:33:01 PM
I bought a green filter sheet from Edmund (#V35-136). It passes quite a bit of red. I considered Colin's suggestion of Roscolux #90. I think #91, Primary Green would be a better choice. It has a better cut off for blue, but passes some long red. I'm also looking at the products of Lee Filters and GAM. For now, I'm using a double layer of the Edmund filter material over electroluminesent lights. 216.46.36.164
Colin - Fri, Mar 30, 01 12:58:37 AM
Don't forget to try Cinegel. It is Rosco for movies. I don't use it myself as I do theatrical lighting design. 64.167.151.5
Colin - Fri, Mar 30, 01 02:32:14 AM
I just put my Rosco #27 Medium Red filter in front of my Limelite phosphor safe light and got almost zero transmission. I got 3 Limelites for $9.95. 64.167.151.5