From: bercov@bevsun.bev.lbl.gov (John Bercovitz) Subject: Re: Viewing Filters (long) Date: 25 Jan 1993 23:33:35 GMT Organization: Lawrence Berkeley Laboratory, California Message-ID: <28628@dog.ee.lbl.gov>
I've written down a few of the filter numbers from the CRC Handbook of Chemistry and Physics and from other places:
filter color use
colorless
UV(0) none absorbs UV
0 clear thickness compensation
1 absorbs UV < 360nm
1A pale pnk skylight filter
1B lt. pink (skylight) cuts blue cast in shade and distance, absorbs UV
yellows
2A pale yel UV 405 nm
2B pl yel absorbs UV 390 nm
2E pl yel absorbs UV
3 lt yel
4 lt yel CCC - corrects outdoor scenes for panchromatic film
6 lt yel (aka K1) partial correction for outdoors
8 yel (aka K2) full correction outdoors for Type B panchromatic film
9 dp yel
11 yl-grn (aka X1) corrects tungsten light for Type B film
12 dp yel minus blue - haze cutting for aerial photography
13 yel-grn (aka X2) corrects tungsten light for Type C panchromatic film
15 dp yel (aka G) contrast control in aerial IR photography
16 yel-org blue absorbtion
18A transmits UV and IR only
oranges and reds
21 org blue and blue-green absorbtion
22 dp org yellow-orange (mercury yellow) increase contrast in blue
preparations for microscopy
23A lt red contrast effects
24 red for two-color photography
25 red (aka A) for tri-color separation, high contrast effect,
aerial IR haze
two-color general viewing
26 red stereo red
29 dp red high contrast, tungsten projection of tri-color, red sep. in
fluor. process
magentas and violets
30 green absorbtion
31 green absorbtion
32 magen minus green
33 strong green absorbtion
34A violet blue separation in fluorescence process
35 contrast in microscopy
36 dk violet
blues and blue-greens
38 red absorbtion
38A Blue red absorbtion, increasing contrast in visual microscopy
39 contrast control in printing motion pictures
40 green two-color photography
44 lt blu-grn minus red, two-color general viewing
44A lt blu-grn minus red
45 contrast in microscopy
46 blue projection
47 blue direct color separation, tungsten tri-color projection
47A lt blue
47B dp blu tri-color separation form transparencies
48 green and red absorbtion
48A green and red absorbtion
49 dark blue
50 very dark blue - mercury violet
greens
52 lt grn
53 middle green
54 very dark green
55 stereo green
56 very light green
57 green for two-color photography
57A lt grn
58 grn tri-color green for separations, contrast in photog & microscopy
59 green for tri-color projection
59A very light green
60 green for tungsten two-color photography
61 dp grn grn tri-color sep, tungsten projection
64 red absorbtion
65 red absorbtion
66 contrast effects in microscopy & medical photography
67A red absorbtion Two-color projection
narrow band
70 dk red IR photography 676 nm
72B dk or-yel 605 nm
73 dk yel-grn 575 nm
74 dk grn mercury green 539 nm
75 dk blu-grn 488 nm
76 dk vio (compound filter) 449 nm
Hg line filters
77 transmits 546 nm mercury line. glass plus gelatin 580 nm
77A transmits 546 nm mercury line. glass plus gelatin 582 nm
photometrics
78 bluish photometric filter (visual)
78AA bluish photometric filter (visual)
78A bluish photometric filter (visual)
78B bluish photometric filter (visual)
78C bluish photometric filter (visual)
86 amber photometric filter (visual)
86A amber photometric filter (visual)
86B amber photometric filter (visual)
86C amber photometric filter (visual)
light balancing
80A blue color correction for daylight film (5500) under 3200K (studio) lamps
80B blue color correction for daylight film (5500) under 3400K (photo) lamps
80C blue color cor. for daylight film (5500) under 3800K (clear flash) lamps
81 amber warming -100K
81A amber color correction for Type B tungsten film under 3400K (photo) lamps
warming -200K
81B amber to remove blue cast in shaded daylight
warming -300K
81C amber to remove blue cast in cloudy/rainy weather; Kodachrome Type A with
flash; warming -400K
81D amber Kodachrome Type A with flash; warming -500K
81EF amber Ektachrome Type B with flash; warming -650K
82 blue cooling +100K
82A blue color correction for Type A tungsten film under 3200K (studio) lamps
cooling +200K
82B blue color correction for Type B tungsten film under 2900K (100w incand.)
cooling +300K
82C blue to remove reddish cast in early morning or late afternoon
cooling +400K
83 amber 16mm commercial Kodachrome in daylight
85 orange color correction for Type A tungsten film in daylight (5500K->3400K)
85B orange color correction for Type B tungsten film in daylight (5500K->3200K)
85C amber converts 5500K (daylight) to 3800K lighting
miscellaneous
79 photographic sensistometry
87 for infrared photography; absorbs visual 770nm ->
87C absorbs visual, transmits IR 830nm ->
88A for infrared photography; absorbs visual 740nm ->
89B for infrared photography 700nm ->
90 monochrome viewing (narrow-band for viewing scene brightness);
about 570->590 nm; 10% luminous transmittance
96 neutral filter for controlling luminance; 9% luminous transmittance
97 dichroic absorption
102 correction filter for Barrier-layer cell
106 correction filter for S-4 type photocell
FL-day purple converts "daylight" fluorescent light for daylight film
FL-W purple converts "white" fluorescent light for daylight film
K2 yellow improves contrast in B&W; absorbs UV and part of violet
G orange greatly improves contrast in B&W; absorbs UV and part
of blue-green
25A red strongest B&W contrast; absorbs UV and part of yellow;
"night filter"
also used as a color separation filter with #47 blue and
#58 green
X0 yel-grn natural rendition of skin and lips of female models B&W?
X1 green Absorbs more red than X0, good for green trees B&W?
Data on a very few narrower band filters:
Filter no. low wavelength high wavelength domin. wl lum. transm. %
Color separation filters:
47 blu 400 475 464 2.8
58 grn 490 600 540 23.7
25A red 590 700 615 14
Narrow band filters:
76 400 470 449 0.046
75 460 530 488 1.3
74 510 570 539 4.0
73 560 600 575 1.3
72B 590 640 605 0.74
70 660 700 676 0.31
This data is from the CRC handbook. Much more data is available in the CRC.