The Goal: Front-to-Back Sharpness
In landscape photography, we typically want everything in focus - from the rocks at our feet to the mountain peaks on the horizon. This requires understanding depth of field: the zone of acceptable sharpness in front of and behind your focus point.
Depth of field is controlled by aperture (f-stop). Smaller apertures (higher f-numbers like f/11, f/16) give more depth of field. But there's a limit - go too small and diffraction softens your image.
Steps to Obtain Focus and Depth of Field
The 9-Step Method:
- 1. First focus on your subject (usually the mountain/background)
- 2. Set your aperture to f/11 as a starting point
- 3. Take a picture
- 4. Press your image review button and zoom in on the picture
- 5. Compare sharpness between subject and everything else in the image
- 6. If everything appears sharp, you're good to go to Step 5
- 7. If parts of the image appear to be not as sharp as your subject, increase your aperture to f/16
- 8. Take a picture at f/16 and review your image for sharpness
- 9. If there is still not enough depth of field, increase your aperture to f/22. Take a picture and review if you have enough depth of field.
Diffraction Warning
Apertures smaller than f/16-f/22 cause diffraction, which actually reduces overall sharpness. If f/22 isn't enough depth of field, consider focus stacking (taking multiple shots at different focus points and blending in post-processing).
Where to Focus
A common question is "where exactly should I focus?" The traditional answer is the hyperfocal distance - the focus point that maximizes depth of field from half that distance to infinity. But calculating this in the field is impractical.
My practical approach: Focus on your main subject (usually the mountain), then check if your foreground is sharp. Adjust aperture as needed using the 9-step method above.
Focus Point Guidelines:
- For distant subjects with minimal foreground: Focus on subject, f/8-f/11
- For scenes with important foreground: Focus 1/3 into scene, f/11-f/16
- For extreme foreground-to-infinity: Consider focus stacking
- Always zoom in on your LCD to verify sharpness before moving on
Finding Your Lens's Sweet Spot
Every lens has an aperture "sweet spot" where it's sharpest - typically 2-3 stops down from wide open. For most landscape lenses, this is around f/8 to f/11.
Start at f/11 and only go smaller if you need more depth of field. Don't default to f/22 "just to be safe" - you'll actually get softer images due to diffraction.
Quick Reference
f/8: Maximum sharpness, limited depth of field
f/11: Excellent sharpness, good depth of field (start here)
f/16: Slight diffraction, extended depth of field
f/22: Noticeable diffraction, maximum depth of field