film-How to Make an Exposure

How to make an Exposure

The Trinity and Beyond

Film

The Trinity-Aperture

• Controls how large the opening is that lets light through to the sensor

• Called f-stops• Full stops

– 1,1.4, 1.8, 2.0, 2.8, 3.5, 4, 5.6, 8, 11, 16, 22,32

• Controls depth of field• The higher the number the smaller the aperture

hole is• The higher the number the more depth of field• To change the aperture use the ring on your lens

Depth of Field

The Trinity-Shutter Speed

• Controls how long light passes through to the film• Change shutter speed with shutter speed dial• Can be anywhere from 1/4000 second to 1

second to minutes• 1/500=one five hundredth of a second• 1” = one second• Anything under 1/60 will have motion blur from

your hands shaking (called camera shake) • Bulb setting-shutter stays open as long as you

press the button

Fast Shutter Speed

Slow Shutter Speed

ISO• Controls how sensitive(fast) your film is• ISO cannot be changed mid roll

– ISO can only be changed with a change of film

• Runs in multiples– 50, 100, 200, 400, 800, 1600, 3200

• 100-400 for bright light• 400-800 for less light• 1600 for very dark situations

– After 800 you begin to have lots of grain

• Your ISO will affect the choices of aperture and shutter speed available to you

• A higher ISO will allow you to use faster shutter speed

Add all three and you have an Exposure

• Now we have to combine all three to make our exposure

• Set your ISO

• Make choices about aperture and shutter and use your light meter to get the correct exposure

Light Meter• Measures the light coming into the camera• This measurement allows you to choose the correct

aperture and shutter speed• Press the shutter release half way down to get a light

meter reading• The goal is to get the perfect exposure

– How your light meter indicated that exposure is correct depends on the camera

• Digital readout, swinging bar, green light…

• Choose an aperture or shutter speed that you want to start with and then then scroll with the other (aperture or shutter speed)until you have the correct exposure

Underexposed Overexposed

Summary of Making an Exposure

• Set your ISO

• Choose your shutter speed or aperture

• Use your light meter to get the corresponding shutter speed or aperture

• Take the photo and appease the film gods!