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You are here:Home » How to Set ISO to Get Pictures Rightly Exposed Without Noise

By Abhishek Ghosh August 22, 2013 9:21 am Updated on August 22, 2013

How to Set ISO to Get Pictures Rightly Exposed Without Noise

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How to set ISO to get pictures rightly exposed without noise is one of the commonly asked question among any type of Digital Camera users– mobile phone to DSLR. Unlike Film, we can actually change the ISO per shot in Digital Camera, but unfortunately after a certain value, we get very bad quality noise. There points are clearly becoming important to know – first is about the Noise in Digital Photography, second is the previous article on ISO in Digital Photography (this is very important to read) and third is Exposure Triangle. In other words, how to set ISO to get pictures rightly exposed without noise, demands some basic knowledge. Do not worry if you are a beginner, read the three articles either after reading this one or one by one the three before reading this one – do not get confused what to read first or rather to start from.

 

How to Set ISO to Get Pictures Rightly Exposed Without Noise : Introduction

 

In a perfect world, all of the pictures may be taken with the ISO to a minimum. In this way, we would get more images absolutely noise-free. Unfortunately, we often find ourselves in situations where it is absolutely necessary to raise the ISO. Typically, these are situations in which we would like to lower the exposure time or decrease the value of opening, light is of too small amount that forces us precisely to raise the value of the ISO- basics of the exposure triangle.

Doing so, will definitely increase the visible noise in the picture. The modern digital cameras have better performance at high ISO values ??than in the past or rather the introduced noise at the same ISO number is lower now. The performance, of course, improves with the increase of the category and the price of the camera. The top models allow professionals to use ISO values ??amounting to several thousands losing very little quality in the picture. The basic models instead (such as the Nikon D3000) can worsen significantly the quality of the shots with values ??greater than 800. How can we then be able to take pictures in dark places by limiting the amount of noise?

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How to Set ISO to Get Pictures Rightly Exposed Without Noise

 
How-to-Set-ISO-to-Get-Pictures-Rightly-Exposed-Without-Noise

Key : Set Auto ISO with Threshold

 

There is a setting, that is present on DSLR cameras and probably also on the bridge camera, which can come to help in these cases. Depending on the model of camera could be a bit hidden in the menu, it is not directly accessible, such as aperture and exposure time. This is the option that helps to set the auto ISO with a threshold for exposure time and ISO value. This setting is available only in non-automatic shooting modes (you can read What Camera Mode to Choose Depending on the Situation, it is very popular for the diagram on Pinterest). Firstly, we can select a value of ISO as base, which will generally be the minimum allowed by our camera, to reduce the noise as much as possible. We can, however, also allow the camera to alter this value automatically when necessary. For this purpose we can activate the automatic ISO and subsequently set the other two parameters:

 

  1. Maximum value of ISO
  2. Minimum value of the exposure time

 

The first of the two parameters indicates the maximum value that can not be exceeded when the ISO is automatically adjusted. The second one specifies the slowest shutter speed that we would like to have. These settings are used when you use the shutter mode to Aperture Priority (most frequently used by many photographers) mode or program. Once you set the aperture, the camera automatically adjusts the exposure time, using the basic value of the ISO set by us. If light conditions do not allow an exposure time equal to or faster than the minimum that we set, then the ISO is increased up to get that minimum value or until it is reaching the maximum set value of ISO. It can happen that the latter is reached without the exposure time has been reduced sufficiently. In this case, we will be forced to shoot with an exposure time too slow.

 

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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