B&H model C

Bell&Howell model C at Filmwerkplaats

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