Which ISO setting should I use for night photography?
When setting an ISO value, a good rule to follow is to always use ISO100 unless you think you really need to change it.
Increasing the ISO will increase the sensitivity of your camera’s sensor, so that you need less light to take a picture. You can set a different ISO value for every picture that you take.
But take care – your camera increases the sensor sensitivity by amplifying the electrical signal generated by the sensor, which makes for a noisier picture (find out how to reduce noise at high ISO settings). If you want top-quality pictures, keep the ISO as low as you can.
Just because you’re shooting in low light, it doesn’t mean that you should increase the ISO to help the camera see in the dark. If you’re using a tripod or you have flash switched on, you can almost always keep the ISO set to 100.
When should I start to increase my ISO settings?
You should use high ISO settings when you want to avoid blur. It’s much better to put up with a bit of noise than end up with camera shake, so increase the ISO as far as you need to when you can’t use a tripod.
Also, a higher ISO can be a good alternative to simply using flash. With flash you can stick with ISO100, but it can ruin the atmosphere (as shown in the middle of the three shots on the right).
A slow-speed approach
With many low-light subjects, it’s best to use an ISO setting of 100.
This shot of a Polish market, for example, was taken indoors at night. But using a tripod, there was no problem in extending the shutter speed to get enough light to the sensor. This gave a bright enough exposure without even touching the ISO controls.
What is camera noise?
All digital cameras create a certain amount of noise in the images they capture. Noise looks a bit like the grain in a picture taken with film – you need to blow the picture up to see it. Fortunately, digital camera sensors are getting better and better at minimising noise.
Noise gets more noticeable as you increase the ISO setting. It’s particularly noticeable in the darker shadow areas, and as well as a grainy texture, the blacks become mottled with colour.
This noise can be minimised using custom settings on your camera, or by using the options provided by image-editing software.
PAGE 1: Overview
PAGE 2: Choosing the right aperture
PAGE 3: Choosing the right shutter speed
PAGE 4: Choosing the right ISO settings
PAGE 5: Choosing the right White Balance
PAGE 6: Using flash in your night photography
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