What is focus stacking?

Focus stacking combines multiple images shot at different focus distances to create a single image with extended depth of field. Each frame is sharp in a different zone. Software (Photoshop, Helicon Focus, Zerene Stacker) blends the sharp regions from each frame.

How many frames do I need?

It depends on the total depth to cover and the DOF per frame. Macro at 1:1 might need 20-50 frames for a few centimetres. Landscape focus stacking might need 3-5 frames from foreground to infinity. Always shoot a few extra frames for safety overlap.

What aperture should I use for stacking?

Use f/5.6 to f/11 for the sharpest per-frame results. Avoid very small apertures (f/16+) where diffraction reduces sharpness. With stacking, you do not need small apertures for depth — you get depth from multiple frames. Wider apertures give sharper individual frames.

How do I shoot a focus stack?

Use a tripod. Manual focus mode. Start at the nearest point and shift focus slightly for each frame. Many cameras have built-in focus stacking (focus bracketing). Alternatively, use a macro rail for precise mechanical focus steps. Keep aperture and exposure constant.

PhotoCalcs

Focus Stacking Calculator — Number of Frames

Plan focus stacking steps for macro or landscape shots with correct overlap.

Focal Length

Aperture

Near Distance

Nearest focus point

Far Distance

Farthest focus point

Sensor (CoC)

How We Calculate This

DOF per Frame

Calculated using the standard thin-lens DOF equations at the average focus distance.

Number of Frames

Frames = ceil(total depth / (DOF x 0.7)) + 1

The 0.7 factor provides 30% overlap between frames for reliable blending.

Frequently Asked Questions

Related Calculators

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Circle of Confusion Calculator

Calculate the circle of confusion for your sensor size, viewing distance and print dimensions. Essential for accurate DOF calculations. Free calculator.

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Estimate background blur disc size for any lens, aperture and subject-to-background distance. Predict bokeh quality before you shoot. Free online calculator.

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Find the exact aperture needed to achieve a target depth of field at any given focal length and subject distance. Free online photography calculator.

Last updated: February 2026

All calculations are estimates based on standard optical and photographic formulas. Results may vary with specific equipment.