Light Exposure

At a Fixed ISO, you got a lens and camera; you need to consider a whole thing about what speed for what amount of light you encounter through a day.

Here is calculator I used: http://www.calculator.org/calculate-online/photography/exposure.aspx

(if you are using a DSLR, you can just use any ISO, such as 1600, 3200, even 6400 sometimes for extra 3 stops of light balance if needed, but for film camera, you can't change for faster film before you finish a roll.)

EV number quick calculation table

L- L-
EV-2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 1415 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -1 -2
L+ L+
ISO 12800 6400 3200 1600 800 400 200100 200 400 800 1600 3200 6400 12800
L+ L-
S 60“ 30” 15“ 8” 4“ 2” 1“ 2 4 8 15 30 60125 250 500 1000 2000 4000 8000
L+ L+
F 1 1.4 2 2.8 4 5.6 8 1116 11 8 5.6 4 2.8 2 1.4 1
Count 15 14 13 12 11 10 9 8 7 6 5 4 3 2 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

in Av, Tv, Sv mode.

125 1iTv 815 301/60 1.4 2 2.8 4 5.6 8 1116film 2i +1 4i +2
f2.8 1iAv -1 128i 64i 32i 16i 8i 4i 2i 30 60 125 250 500 1000 2000 40008000Digif8 -3 f4 -1 f1.4+2
L- L-
EV-2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 1415 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -1 -2
L+ L+
ISO 12800 6400 3200 1600 800 400 200100 200 400 800 1600 3200 6400 12800
L+ L-
S 60” 30“ 15” 8“ 4” 2“ 1” 2 4 8 15 30 60125 250 500 1000 2000 4000 8000
L+ L+
F 1 1.4 2 2.8 4 5.6 8 1116 11 8 5.6 4 2.8 2 1.4 1
Count 15 14 13 12 11 10 9 8 7 6 5 4 3 2 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

EV number is amount of lux in environment, for chart refer to http://www.fredparker.com/ultexp1.htm

Lens requirement after 10pm

  • for under EV3, f1.4 lens required with ISO 800, achieve 1/30sec
  • with f1.8 lens, at ISO 1600, survive 1/40 sec

EV 1 and 0: for night sky with stars

  • on tripod, ISO 200, 30 sec, f8. (EV 0)
  • hand hold, ISO 6400, 1/30 sec, f2.8 (EV 1)

EV 2 (Light off): for screen light or almost tiny lights or indirect street light

  • with f1.7 lens, at ISO 1600, I shot at 1/20
  • with f1.4 lens, at ISO 800, you are risking at 1/15 sec
  • with f1.2 lens, at ISO 200 (a common negative), shoot at 1/4 sec
  • with f1.2 lens, at ISO 400 (a common negative), shoot at 1/8 sec
  • (1st shot I shot at ISO 1600 with f1.7 lens, 2nd shot at ISO1600 with f1.4)

EV 3 (night driving): far street nights, small room light

  • with f1.2 lens, at ISO 200 (a common negative), shoot at 1/8 sec
  • with f1.2 lens, at ISO 400 (a common negative), shoot at 1/15 sec
  • with f1.4 lens, at ISO 800, you are around 1/30
  • f2.8, ISO 3200, 1/30 sec

—————10pm—————————————————

EV 4 : close street light, close candle, small room light, indoor nature light

  • with f1.2 lens, at ISO 200 (a common negative), shoot at 1/15 sec
  • with f1.2 lens, at ISO 400 (a common negative), shoot at 1/30 sec
  • with f1.4 lens, at ISO 800 (a common negative), shoot at 1/50 sec
  • f2.8, ISO 3200, 1/60 sec

EV 5 (lighten) (dim shopping mall, public indoor light array condition, mrt)

  • with f1.2 lens, at ISO 200 (a common negative), shoot at 1/30 sec
  • with f1.2 lens, at ISO 400 (a common negative), shoot at 1/60 sec
  • with f1.4 lens, at ISO 800, 1/125 sec (125~250)

EV 6 (well lighten): bright shopping mall, bright public indoor light array condition, bright mrt

  • with f1.2 lens, at ISO 200 (a common negative), shoot at 1/60 sec
  • with f1.2 lens, at ISO 400 (a common negative), shoot at 1/120 sec
  • with f1.4 lens, at ISO 800, 1/250 sec

—————7pm—————————————————

EV 7 (over lighten): stadium lights, stage show, inside MRT train

  • with f1.2 lens, at ISO 200 (a common negative), shoot at 1/120 sec
  • with f1.2 lens, at ISO 400 (a common negative), shoot at 1/250 sec
  • with f1.4 lens, at ISO 400 (a common negative), shoot at 1/250 sec
  • with f1.4 lens, at ISO 800, 1/500 sec,
  • at f2.8, at ISO 800, 1/125
  • at f3.5, at ISO 800, 1/100

EV 8 (over lighten): fashion street, stadium lights, stage show

  • at f2.8, at ISO 200 (a common negative), shoot at 1/60 sec
  • at f2.8, at ISO 400 (a common negative), shoot at 1/125 sec

EV 9 (spotlight):

  • at f2.8, at ISO 200 (a common negative), shoot at 1/125 sec
  • at f2.8, at ISO 400 (a common negative), shoot at 1/250 sec

—————6pm————————————————

EV 10 : after sunset

  • at f4, at ISO 200 (a common negative), shoot at 1/125 sec
  • at f4, at ISO 400 (a common negative), shoot at 1/250 sec

EV 11 (Lovely 11, last of f1.4): Sunset soft warm light, deep shadow

  • at f4, at ISO 200 (a common negative), shoot at 1/250 sec
  • at f4, at ISO 400 (a common negative), shoot at 1/500 sec
  • at f2.8, at ISO 800, shoot at 1/2000 sec
  • at f1.4, at ISO 400, shoot at 1/4000 sec
    (this shot at f1.4 at my kx top speed of 1/6000 at ISO 400)

—————-start of f4, end of f1.4——————-

EV 12 (Sunny Day): (half moon), open shade

  • at f2.8, at ISO 400, shoot at 1/2000 sec
  • at f4, at ISO 200 (a common negative), shoot at 1/500 sec
  • at f4, at ISO 400 (a common negative), shoot at 1/1000 sec

EV 13 (Cloudy sun): no shadow cloudy sun

  • at f4, at ISO 200 (a common negative), shoot at 1/1000 sec
  • at f4, at ISO 400 (a common negative), shoot at 1/2000 sec
  • at f8, at ISO 200 (a common negative), shoot at 1/250 sec
  • at f8, at ISO 400 (a common negative), shoot at 1/500 sec

EV 14 (Hazy Sun): Moonlight, hazy and week sun

  • at f4, at ISO 200 (a common negative), shoot at 1/2000 sec
  • at f4, at ISO 400 (a common negative), shoot at 1/4000 sec
  • at f8, at ISO 200 (a common negative), shoot at 1/500 sec
  • at f8, at ISO 400 (a common negative), shoot at 1/1000 sec

—————1pm————————————————

EV 15 : Sunny 16 rules, hot sun

  • at f16, at ISO 200 (a common negative), shoot at 1/250 sec
  • at f16, at ISO 400 (a common negative), shoot at 1/500 sec
  • at f4 (4 stops), at ISO 200 (a common negative), shoot at 1/4000 sec
  • at f4 (4 stops), at ISO 400 (a common negative), shoot at 1/8000 sec

EV 16 : Hot sun + Reflective ground

  • half of Sunny 16 rules