Photography guide

How to choose aperture

Aperture controls light, depth of field and how optical flaws appear. Start with the visual result you need rather than a single “best” f-number.

Core principle

Aperture controls light, depth of field and how optical flaws appear. Start with the visual result you need rather than a single “best” f-number.

Practical workflow

Wide apertures are common for portraits, while groups often need more depth. For landscapes, f/8–f/11 is frequently a useful balance between depth and diffraction.

1. Define the image goal and working conditions.
2. Choose baseline settings and make a test frame.
3. Check focus, histogram and critical image areas.
4. Record the settings that worked and why you changed them.

What to verify before finishing

After changing aperture, check shutter speed and ISO. Use the AparatTo calculators to compare exposure and depth of field.

Do not treat a single rule as a guarantee. Conditions, equipment design and output size change the requirements. Record settings and conclusions in the AparatTo planner.