The SimCam: Film and Digital Camera Simulator
Film Speed Simulation

All film has a speed rating - even digital cameras use the common ISO speed index. Slower films produce sharper images but require large amounts of light. Fast films can be used in low light situations in exchange for an increase in contrast and noise/grain.

speed rating sensitivity contrast grain
ISO 50
low
low
low
ISO 100
medium
medium
medium
ISO 200
medium
medium
medium
ISO 400
high
high
high
ISO 800+
very high
very high
very high
  • ISO 50 is slower than ISO 100, and requires 1 stop more light
  • ISO 400 is faster than ISO 100, and requires 2 stops less light

Sometimes using a faster film speed is the only way to get a sharp image. Try the following example to learn how shutter speed, aperture, AND film speed all use the interchangable photographic "stop".

 

SimCam Film Speed Example:
First set both SimCams to 1/60 f/4 and shoot a picture. The ISO 400 film is overexposed, so you need to compensate by reducing light - move the shutter or aperture 2 stops higher to balance the exposure. (For example move the shutter to 1/250, or the aperture to f/8)

All stops are interchangable. By going from ISO 100 to ISO 400, you have two stops more light. You can "spend" those stops on aperture or shutter speed.

Notice the increased grain and contrast of the ISO 400 example. Remember, if you need more light than, you can increase the film speed.

ISO 100 Film ISO 400 Film
Shutter:
Aperture:
Shutter:
Aperture:
final exposure: final exposure: