+44 (0)7969 207207 [email protected]

The Best ISO Setting

With the advent of digital photography came huge flexibility in the ability to change the ISO setting of the camera. Previously you needed to wait until you were ready to change your film in order to move to a different ISO. Now you can change the ISO any time and as a result it’s one of the most misused controls. Few photographers really understand the effect of changing the ISO setting and a question that’s often asked is “what’s the best ISO setting”.

What is an ISO Setting?

The ISO setting is a common standard using the photography industry to measure of how sensitive the cameras sensor is to light. The higher the ISO number, the more sensitive the sensor is. For example a setting of ISO200 is more sensitive than ISO100.

When we use a more sensitive ISO setting it can make it easier for the camera to achieve the exposure of the image. For example if we need a shutter speed of 1/60” (second) when using ISO100, if we increase the ISO to ISO200 we can use a faster shutter speed of 1/120”. The benefit of the faster shutter speed is that we are less likely to experience camera shake when taking the picture.

High ISO Drawbacks

If higher ISO settings allow us to use faster shutter speeds and this is an advantage, why would we not use the maximum ISO setting. The answer is simple noise. You see the camera sensor doesn’t really become more sensitive, it’s actually the signal to the sensor that’s boosted. And with this boost to signal strength noise is also introduced and boosted.

Noise is the enemy of the photographer and can seriously degrade the quality of your photography. You can see a simple comparison below.

Low ISO image example

Low ISO image example

High ISO image example

High ISO image example

Avoiding Camera Shake

Avoiding camera shake is the best and probably only reason that you will want to use a higher ISO. Camera shake can also damage the quality of your photography and can make image appear soft. Look at the following two images.

This first image was captured using ISO80 which is lowest ISO this particular camera can be set to. It should produce the lowest noise levels and be the highest quality.

Section of an ISO80 image viewed at 100% magnification

Section of an ISO80 image viewed at 100% magnification

Now compare this to the next image.

Section of an ISO400 image viewed at 100% magnification

Section of an ISO400 image viewed at 100% magnification

This image was captured at ISO400 and therefore contains higher levels of noise than the first image. Despite this the image is noticeably sharper.

The Best ISO Setting to Use

The best ISO setting to use is therefore the lowest one that allows you to avoid camera shake. You might not realise it but longer focal length lenses require faster shutter speeds to avoid camera shake. As a rough rule of thumb, the shutter speed should be at least as fast as the inverse of the lens focal length. This means if you are using a 20mm lens then your shutter speed should be faster than 1/20”. If your lens is a 100mm focal length then aim for shutter speeds faster than 1/100”.

The one thing you must avoid is placing your camera in Auto ISO. Manufacturers are usually overly conservative and ISO setting tend to rise too quickly in the auto mode. Get into the habit of manually selecting your ISO, watching the shutter speed and only increasing the ISO when you notice the shutter speed getting too slow.

But the ISO setting in your camera is just one of three settings that allow you to take control of the expoosure. The other two are shutter speed and aperture. Learn more by reading my article Creative Camera Control. And if you haven’t already done so, I recommend reading my article what is an f-stop.

If you would like to know more about this subject why not consider my book “Mastering Your Camera: Learning to use the creative controls”.

More Photography Tutorials

You’ll find more high quality, free tutorials on my Landscape Photograph Tutorials page.

As an Amazon Associate I earn from qualifying purchases.

Get Landscape Photography: Shoot Like a Pro

Get the inside edge on what it takes to shoot consistently good landscapes.

30 day, no questions money back guarantee

Buy now or learn more...

FREE Book Offer

Get your FREE copy of "6 Steps to Shooting Brilliant Landscape Photography"  by subscribing to my monthly newsletter.

Follow the advice in this deceptively simple book to significantly improve your landscape photography. Organised into 6 simple lessons, this valuable and detailed guide provides information that’s often overlooked. In fact, lesson 3 is so obvious that most photographers ignore it completely.

If you want to improve your Landscape Photography fast, follow this book.

Subscribe Here

  • Enter your details using the form on the right. I will then send you an initial email to confirm you’ve entered your email correctly.
  • Follow the instruction in my email to confirm your subscription.
  • After confirming your subscription I’ll send you a discount code to purchase my book for free. You’ll then be able to download it in your chosen format.

My Promise to You: I will never share or SPAM your email.

[crp]

Pin It on Pinterest

Please Share This

Please share this post with fellow photographers!

Photography Tutorials The Best ISO Setting