B&H model C
This Bell&Howell model C is an additive colour printer with a RGB (red-green-blue light) lamp house. This printer operates now with a controller that is designed by James Rubery (in accordance with the original manual). This controller is to operate the 3 valves in RGB in 0 to 50 steps each. 0 is closed and 50 is completely open. 12 steps is 1 stop
The gate has the options
- composite = full image including optical sound outline
- picture = only the image, no outline framing
- sound pos = only the optical sound part when printed as positive from a negative
- sound rev = only the optical sound part when printed as positive from a positive. The framing is a fraction bigger than sound pos to avoid a white line in between image and sound track.
Standard filtering for printing Colour + B&W on the B&H model C
B&H 12 steps = 1 stop (equivalents 0.30 ND in Kodak wratten filters)
– valve range 1 – 50 steps
– knobs 1 – 24 steps
correction filters
Kodak 2B to block UV neccesary for Eastman CP
filter place in printer = in front of light end or in front of Blue
Kodak 2E for Eastman Ektachrome or other E6 processes
B&W to CP / ANIM standard filters =
2B
0.20 ND
1.20 Y
0.50 M
0.05 C
Tinting effect = FLASHING
Toning effect = DIM printing with B&W NEG to COLOR PRINT
DFL (DESMET FLASH) / ANIM standard filters =
2B
1.40 ND
0.60 M
1.00 Y
0.05 C
K = 4 Red – 16 Green – 19 Blue
DIM (DESMET IMAGE) / ANIM standard filters =
2B
0.20 ND
1.20 Y
0.50 M
0.05 C
K = 6 Red – 12 Green – 18 Blue
COlOR NEG LAD (LAD = Labaratory Aim Density)
K = 14 – 9 – 19
+ 0.30 ND in front of Red
filters = 2B + 0.90 ND
Internegative Color (on Kodak 50D 7203)
Pos to neg – LAD should be after developing (densitometer measuring)
R – 0.90
G – 1.30
B – 1.70
FLASH aim LAD (you then have to subtract the orange base)
R – 0.15
G – 0.15
B – 0.15
COLOR CORRECTING (NEG – POS)
(general GAMMA of NEG = 0.65
CYAAN MAGENTA YELLOW
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–-------------------- neutral image
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RED GREEN BLUE
Cy + Ma – Blue
Cy + Y – Green
Ma + Y – Red