What is ISO photography?
- Jun 25
- 3 min read
ISO in photography refers to how sensitive your camera’s sensor is to light. It plays a key role in how bright or dark your image appears and works alongside shutter speed and aperture to shape your final exposure. When I’m out capturing landscape photography, ISO is something I adjust carefully depending on the light I’m working with. It can help to think of ISO as the setting used to fine-tune the brightness of an image without changing the overall feel of motion or depth.
What is ISO in photography?
How does ISO affect your photos?
How I use ISO in New England landscape photography
1) What is ISO in photography?
ISO controls how easily your camera collects light when you take a photo. A lower ISO setting means the sensor is less sensitive, so it needs more light to create a properly exposed image. A higher ISO increases sensitivity, meaning the sensor needs less light to build the same exposure.
Most modern cameras allow you to adjust ISO quickly using a dial or menu setting. In automatic modes, your camera will choose ISO for you, but in manual or semi-manual modes, you can control it yourself depending on the conditions.
(For those of you interested, ISO stands for International Organization for Standardization, but this doesn’t help explain what it is at all!)
2) How does ISO affect your photos?
ISO controls brightness and influences the level of detail and clarity in your image. It’s a simple adjustment, but it has a noticeable impact on the final result. Lower ISO settings, where the sensor is less sensitive to light, produce cleaner, more detailed images with minimal noise or grain. This works well in bright daylight or when you want to preserve fine textures in a landscape. Higher ISO settings allow you to shoot in darker conditions, but they come with a trade-off. As ISO increases, so does the visible grain in an image, which can soften details and reduce overall image quality.
While ISO will always depend on your shutter speed, aperture, and available light, it can help to think of it in terms of simple starting ranges rather than fixed rules:
ISO 100-200: Bright daylight
ISO 200-800: Golden hour or shifting light
ISO 800+: Low light, sunset, forests, or dusk
3) How I use ISO in New England landscape photography
In New England landscape photography, where light can shift quickly, I use ISO as a subtle adjustment rather than a primary tool. In most cases, I set my shutter speed and aperture first, then adjust the ISO to fine-tune the exposure and bring everything into balance. My preferred technique is to start with a low ISO setting to preserve as much detail as possible. This works well during early mornings, bright afternoons, and even some golden hour conditions when there’s still enough natural light. In lower light conditions, especially around sunset or in more shaded environments like forests, I increase ISO to maintain a balanced exposure. This allows me to keep my shutter speed and aperture where I want them, without losing too much clarity. Capturing subtle changes in light, movement in the landscape, or a fleeting atmosphere often matters more than having a perfectly noise-free image.
Small adjustments in ISO can make a noticeable difference, so it’s always worth taking a moment to review your settings as conditions change. Over time, understanding how ISO behaves in different lighting will become second nature, and you’ll start to use it more intuitively.
Hi, I’m Erica Joy, and photography has been a way for me to foster connections, find my calm, and spark my creativity. Every time I set up my camera, whether I’m capturing a quintessential New England scene or wonders around the world, my goal is to preserve not only the beauty in front of me but also the emotions it stirs within me. Whether you’re interested in landscape photography, browsing my art prints, joining me for workshops or community events, or commissioning a custom print, I’d love to help you connect with the beauty of the world.
If you enjoyed this article, you might also like “Night Photography: Tips for Capturing Beautiful Photos After Dark”.
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