Camera ISO & Noise Guide
Search for your camera to find its maximum usable ISO, noise performance rating, and practical tips for shooting at high ISO settings. Compare any two cameras side by side.
Cameras from the same brand, sorted by usable ISO performance.
| Camera | Sensor | Usable ISO | Rating |
|---|---|---|---|
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Understanding ISO and Noise
ISO controls how sensitive your camera's sensor is to light. Keep it low (100 or 200) and you get clean, detailed images. Crank it up to 3200, 6400, or beyond and the image gets brighter, but you start paying for it with noise: those grainy speckles and colour artifacts that eat into your detail.
Understanding this trade-off is one of the most practical things you can learn as a photographer.
What Causes ISO Noise?
When you raise the ISO, your camera amplifies the electrical signal coming off the sensor. That amplification boosts your image data, but it also boosts random electronic interference riding alongside it. The result? Visible noise, particularly in shadow areas and uniform tones like blue skies.
There are two types worth knowing about. Luminance noise is monochrome grain that can actually look quite film-like. Some photographers don't mind it at all. Chroma noise is the ugly one: coloured blotches that are more distracting and harder to fix in post.
Why Sensor Size Matters
Bigger sensors collect more light per pixel. More light means a stronger signal relative to the electronic noise. It really is that simple.
This is why full-frame cameras consistently outperform APS-C and Micro Four Thirds sensors at high ISO. A full-frame sensor has roughly four times the surface area of a Micro Four Thirds sensor, which is a huge advantage when the light gets low. Medium format sensors push that advantage even further.
How to Minimize Noise in Camera
Start with the obvious: keep your ISO as low as you can. Open up your aperture, slow down your shutter speed, or add light with a flash or reflector before you touch the ISO dial.
When you do need to push the ISO, try exposing to the right: slightly overexpose (without clipping your highlights) and pull the exposure back in post. A brighter exposure needs less amplification, which means less noise. It works surprisingly well.
And always shoot in raw format. It gives you far more flexibility for noise reduction when you're editing.
Noise Reduction in Post-Processing
This is where things have changed dramatically. Modern AI-powered tools like Adobe Lightroom's AI Denoise, DxO PureRAW, and Topaz DeNoise can pull off results that were genuinely impossible a few years ago. They analyse the noise pattern and separate it from actual image detail, letting you recover shots you might have written off.
Even smartphone cameras are in on it now, using computational photography to stack multiple frames and reduce noise in real time.
When High ISO is Worth It
A noisy photo is always better than no photo.
At a concert, a sporting event, or when you're photographing wildlife at dusk, you need a fast enough shutter speed to freeze the moment. Pushing ISO to 6400 or 12800 to get the shot? That's the right call. You can reduce noise in post, but motion blur from a too-slow shutter speed cannot be fixed.
Street photographers, photojournalists, and event shooters work at high ISO values all the time. Their images are no less powerful for it.