Wratten Filter Codes and Uses



This is a listing of Wratten Filters by number, their color and applications. It was compiled from the CRC Handbook where more filters and additional charactristics are also listed.


Wratten filter
number
coloruse
UV(0)noneabsorbs UV
0clearthickness compensation
1absorbs UV < 360nm
1Apale pnkskylight filter
1Blt. pink(skylight) cuts blue cast in shade and distance, absorbs UV
2Apale yellowUV 405 nm
2Bpale yellowabsorbs UV 390 nm
2Epale yellowabsorbs UV
3light yellow
4light yellowCCC - corrects outdoor scenes for panchromatic film
6light yellow(aka K1) partial correction for outdoors
8yellow(aka K2) full correction outdoors for Type B panchromatic film
8N5yellowas 8 above with +0.5 neutral density
9deep yellow
11yl-grn(aka X1) corrects tungsten light for Type B film
12deep yellowminus blue - haze cutting for aerial photography
13yellow-green(aka X2) corrects tungsten light for Type C panchromatic film
15deep yellow(aka G) contrast control in aerial IR photography
16yellow-orangeblue absorbtion
18Atransmits UV and IR only
21orangeblue and blue-green absorbtion
22deep orangeyellow-orange (mercury yellow) increase contrast in blue
23Alight redcontrast effects
24redfor two-color photography
25red(aka A) for tri-color separation, high contrast effect,
26redstereo red
29deep redhigh contrast, tungsten projection of tri-color, red sep. in
30green absorbtion
31green absorbtion
32magentaminus green
33strong green absorbtion
34Avioletblue separation in fluorescence process
35contrast in microscopy
36dark violet
38red absorbtion
38ABluered absorbtion, increasing contrast in visual microscopy
39contrast control in printing motion pictures
40greentwo-color photography
44light blue-greenminus red, two-color general viewing
44Alight blue-greenminus red
45contrast in microscopy
46blueprojection
47bluedirect color separation, tungsten tri-color projection
47Alight blue
47Bdeep bluetri-color separation form transparencies
48green and red absorbtion
48Agreen and red absorbtion
49dark blue
50very dark blue - mercury violet
52lt grn
53middle green
54very dark green
55stereo green
56very light green
57greenfor two-color photography
57Alight green
58greentri-color green for separations, contrast in photog & microscopy
59greenfor tri-color projection
59Avery light green
60greenfor tungsten two-color photography
61deep greengreen tri-color separation, tungsten projection
64red absorbtion
65red absorbtion
66contrast effects in microscopy & medical photography
67Ared absorbtion; two-color projection
70dark redInfrared photography 676 nm
72Bdark orange-yellow605 nm
73dark yellow-green575 nm
74dark greenmercury green 539 nm
75dark blue-green488 nm
76dark violet(compound filter) 449 nm
77transmits 546 nm mercury line. glass plus gelatin 580 nm
77Atransmits 546 nm mercury line. glass plus gelatin 582 nm
78bluishphotometric filter (visual)
78AAbluishphotometric filter (visual)
78Abluishphotometric filter (visual)
78Bbluishphotometric filter (visual)
78Cbluishphotometric filter (visual)
86amberphotometric filter (visual)
86Aamberphotometric filter (visual)
86Bamberphotometric filter (visual)
86Camberphotometric filter (visual)
80Abluecolor correction for daylight film (5500) under 3200K (studio) lamps
80Bbluecolor correction for daylight film (5500) under 3400K (photo) lamps
80Cbluecolor cor. for daylight film (5500) under 3800K (clear flash) lamps
81amberwarming -100K
81Aambercolor correction for Type B tungsten film under 3400K (photo) lamps; warming -200K
81Bamberto remove blue cast in shaded daylight; warming -300K
81Camberto remove blue cast in cloudy/rainy weather; Kodachrome Type A with flash; warming -400K
81DamberKodachrome Type A with flash; warming -500K
81EFamberEktachrome Type B with flash; warming -650K
82bluecooling +100K
82Abluecolor correction for Type A tungsten film under 3200K (studio) lamps; cooling +200K
82Bbluecolor correction for Type B tungsten film under 2900K (100w incand.); cooling +300K
82Cblueto remove reddish cast in early morning or late afternoon; cooling +400K
83amber16mm commercial Kodachrome in daylight
85orangecolor correction for Type A tungsten film in daylight (5500K->3400K)
85Borangecolor correction for Type B tungsten film in daylight (5500K->3200K)
85Camberconverts 5500K (daylight) to 3800K lighting
79photographic sensitometry
87for infrared photography; IR 770nm ->
87Cabsorbs visual, transmits IR 830nm ->
88Afor infrared photography; IR 740nm ->
89Bfor infrared photography; IR 700nm ->
90monochrome viewing (narrow-band for viewing scene brightness); about 570->590 nm; 10% luminous transmittance
96neutralfilter for controlling luminance; 9% luminous transmittance
97dichroic absorption
102correction filter for Barrier-layer cell
106correction filter for S-4 type photocell
FL-daypurpleconverts daylight fluorescent light for daylight film
FL-Wpurpleconverts white fluorescent light for daylight film
K2yellowimproves contrast in B&W; absorbs UV and part of violet
Gorangegreatly improves contrast in B&W; absorbs UV and part of blue-green
25Aredstrongest B&W contrast; absorbs UV and part of yellow; "night filter" also used as a color separation filter with #47 blue and #58 green
X0yellow-greennatural rendition of skin and lips of female models; B&W
X1greenAbsorbs more red than X0, good for green trees; B&W


Data on a very few narrower band filters:


Color separation filters:
Filter no.low lhigh ldomin. llum. transm.
47blue4004754642.8
58green49060054023.7
25Ared59070061514
Narrow band filters:
Filter no.low lhigh ldomin. llum. transm.
76400470449.046
754605304881.3
745105705394.0
735606005751.3
72B590640605.74
706607006760.31


This file was found in the photo-3D FTP-able archives at csg.lbl.gov.



Further Reading




A good primer on filters for Black and White film