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Photography Basics Cheat Sheet by

ISO, exposure, aperture, F/something, can all be a bit overwhelming. Here's a cheat sheet with some of the basics.

ISO

ISO controls the amount of light that your camera lets in, and refers to the sensit­ivity of film (or digital sensors today).
ISO 100
Outdoors and sunny
ISO 400
Indoors and well lit, or outdoors and cloudy
ISO 800
Indoors without flash
ISO 1600
Dark, or fast movement

Shutter Speed

Shutter speed controls how long the camera's shutter is open for. The longer it is open, the more light it lets in.
1/2000s
Super-fast subject, like a bird in flight
1/1000s
Fast subject, like a sports car moving
1/500s
Fast subject, like a normal car moving
1/250s
People moving, dancing, jumping
1/125s
People walking
1/60s
Slow-m­oving or stationary subject indoors
1/20s
Moving water
1/10s
Low-light, low-motion landscape, like a sunset
1-3s
Deliberate blur, like you might use for falling water or a crowd moving
21-30s
Dark skies, Milky Way
10 minutes
Star trails
Anything from 1/60s down, you should consider using a tripod.

Aperture (F-stop numbers)

Aperture controls how open your lens is to receive light, and is measured with an F-stop number. The smaller the aperture, the larger the F-stop number and the less light is allowed into the lens.
F/1.4, F/2, F/2.8
Low-light photos, very shallow depth of field, portraits with bokeh blur, astrop­hot­ography
F/4, F/5.6, F/8
Good general use, greater depth of field, more objects in focus at different distances
F/11, F/16, F/22
Landsc­apes, very well-lit photos, very deep depth of field
Each lens has its own "­sweet spot", and this is typically two to three F-stop values from the maximum aperture of that lens.
 

The Exposure Triangle

The exposure triangle is three settings: ISO, shutter speed, and aperture. Here are some examples of how to use it.
Sunny Day, Outdoors
F/2.8, 1/1000, ISO 400
Wide aperture for lots of light, fast shutter to reduce blur, low ISO to reduce noise. A bright, cheerful image with plenty of detail.
Low-Light Night
F/4, 1/20, ISO 1600
Moderate aperture to balance light and depth, slight blur, high ISO for low light. A cozy, warm image with a dreamy atmosp­here.
Creative Portra­iture
F/1.8, 1/125, ISO 200
Background blur highli­ghting subject, reduced subject blur, moderate ISO. A beautiful, shallo­w-f­ocused portrait with a creamy bokeh.

Exposure Issues

Overexposure
An image might be faded, be too bright, and have low detail in bright areas. Decrease aperture, faster shutter speed, or decrease ISO.
Underexposure
An image is dark, and hard to see properly. Increase aperture, slower shutter speed, or increase ISO.
Blown Highlights
Bright areas of the image appear pure white (lost all detail). Use exposure compen­sation (-1/3 or -2/3 stop), decrease ISO, or faster shutter speed.
Clipped Shadows
Dark areas of the image appear pure black (lost all detail). Increase aperture, slower shutter speed, or increase ISO.
Noise
Image appears grainy. Decrease ISO, increase aperture, or slower shutter speed.
Motion Blur
Image appears blurry (e.g., with fast-m­oving subject). Faster shutter speed, decrease aperture, or increase ISO.

Focal Length

The focal length of a lens is the distance, in millim­eters, between the "­nodal point" of the lens and the camera's sensor.
A higher focal length lens has a smaller field of view, like it's zoomed in further. Good for photog­raphing something small or far away.
A lower focal length lens is good for wider photos, like landsc­apes.
 

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