Level 5
One hen, two ducks, three squawking geese, four limerick oysters, five corpulent porpoises...
Flashlight Powders
Chemicals Used In Black & White Photography
Chemical What It Does
K Bromide restrainer
Benzotriazole restrainer
Alum = K Aluminum Sulfate hardening agent
Borax mild accelerator
Boric Acid in some fixers
Glycin slow acting developer
Halides salts of fluorine, chlorine, bromine and iodine
Formalin hardener
Chrome Alum hardener
Hydrogen Peroxide a bleach
NA Metaborate mild alkali
Metol soft working developer same as Kodak's Elon
Monohydrated = containing 1 water molecule per molecule of the chemical substance
Phenidone = Ilford's developer - 1-phenyl-3-pyrazolidene
A substitute for Metol by using 1/10th as much Phenidone
K Bromide restrainer
K Ferricyanide with hypo, it acts as a bleach, used to reduce density of the
photo image
NA Carbonate energetic alkali, an accelerator in developers
NA Sulfite Preservative and slow acting silver solvent
NA Tetraborate Borax?
NA Hydroxide very high Ph
Photography Calculations
P = pupillary dilation factor
C = circle of confusion
V = film format/image size
S = print size
D = film to subject distance, print viewing distance
dn = nearest point in focus
df = farthest point in focus
U = subject distance
F = focul length
f = F stop
H = hyperfocul distance
u = subject size
V = lens to film distance
M = magnification = v/u
t = depth of field
E = exposure compensation
1/V + 1/u = 1/F and M = v/u = V/U, u = V/M
V = uM
M = F/subject distance - F
V (Lens to film distance) = (M + 1)F
effective apperture = f(M + 1)
close-up exposure time = (M +1)^2 (time of distant exposure)
More to come, this is incomplete...