Every photographer has had the moment: the shot looked perfect, but at home the eyes are soft or the background is sharp instead of the subject. Sometimes the camera will not focus at all. Most focus problems have simple, common causes, and once you know them you can fix them on the spot. This lesson is a practical troubleshooting guide that brings together everything from this course.
What counts as a focus problem?
A focus problem means the plane of focus, explained in what is focus, is not where you wanted it, or the camera cannot set focus at all. Before treating a soft photo as a focus problem, first rule out motion blur and camera shake, using the diagnosis steps from that same lesson. A focus problem shows one clear sign: something in the photo is sharp, just not the right thing, or nothing is sharp even though nothing moved.
The most common focus problems
| What you see | Most likely cause | Fix |
|---|---|---|
| The camera will not autofocus at all | Lens or camera set to manual focus (MF) | Check the AF/MF switch on the lens and the focus mode in the camera |
| The lens hunts back and forth and gives up | Too little light or contrast | Focus on an edge with contrast, add light, use the AF-assist lamp, or focus manually |
| The shutter will not fire | Subject closer than the lens can focus | Step back until the lens can focus |
| The background is sharp, the subject is soft | Wrong focus point or wide-area mode chose the background | Use single point on the subject, or subject detection; see focus points |
| Moving subjects are soft | Single-shot AF used for a moving subject | Use continuous AF; see single and continuous autofocus |
| Eyes soft, ears or nose sharp | Very shallow depth of field and a slightly wrong focus point | Use eye detection or precise single point, or close the aperture a little |
| Focus is on a fence, glass or branch | AF chose the nearer object | Use a small focus area through a gap, or manual focus; see manual focus |
| Focus was right, then wrong after recomposing | Focus and recompose at shallow depth of field | Move the focus point instead of the camera |
Too close: minimum focusing distance
Every lens has a minimum focusing distance: the closest distance at which it can focus. It is often printed on the lens barrel. If you are closer than that, the lens physically cannot make the subject sharp, and in single-shot AF the camera usually refuses to take the photo.
Beginners often meet this with food, flowers and small objects. The fix is simple: step back a little, then zoom in or crop if you want the subject bigger. Getting much closer needs special equipment, covered in macro lenses and alternative magnification methods.
Front focus and back focus
Sometimes the camera focuses consistently a little in front of where you aimed (front focus) or a little behind it (back focus). For example, you focus on an eye, and the eyelashes or the ear are sharpest instead.
On DSLR cameras, this can happen because the autofocus sensor is separate from the image sensor, as explained in how autofocus works. Tiny manufacturing differences between a camera and a particular lens can add up. Many DSLRs offer a setting to correct it, called AF Microadjustment (Canon) or AF Fine-Tune (Nikon).
Remember:Mirrorless cameras measure focus on the image sensor itself, so this kind of front or back focus is very rare and they usually have no microadjustment setting. If a mirrorless camera keeps missing in the same direction, the camera and lens may need service.
Before blaming your equipment, test properly: put the camera on a tripod, focus carefully on a flat, detailed target at an angle (such as a ruler on a table), at your widest aperture, and compare the result with manual focus using magnification. Most "bad lens" complaints turn out to be technique, settings or movement, not a faulty lens.
Focus priority and release priority
Many cameras let you decide what happens when you press the shutter before focus is confirmed. With focus priority, the camera waits until focus is found, so you may miss the moment but rarely miss focus. With release priority, the camera takes the photo immediately, so you never miss the moment but may sometimes miss focus. Single-shot AF often defaults to focus priority and continuous AF to release priority. Check your camera's menu if your camera seems to "refuse" to shoot, or shoots out-of-focus frames during action.
A quick checklist when focus fails
- Check the AF/MF switch and the camera's focus mode.
- Check that you are not closer than the minimum focusing distance.
- Check where the focus point is and what it is covering.
- Choose single-shot for still subjects and continuous for moving ones.
- Give autofocus contrast and light: an edge, more light, or the AF-assist lamp.
- Clean the lens and check the lens contacts are free of dirt if focusing is erratic.
- If nothing works, switch to manual focus with magnification.
Common mistakes
- Blaming the lens first: most focus misses come from settings, focus point placement or movement.
- Not checking in playback: zoom in after the first few shots of every new situation.
- Ignoring the focus box: the camera shows where it focused; look before you press fully.
- Testing on a flat wall straight on: you cannot see front or back focus that way; use a target at an angle.
How professionals avoid missed focus
Professionals prevent focus problems more than they fix them. They watch the focus box at every important moment, choose AF modes before the action starts, and zoom into the first frames of every new scene. When a moment matters, they shoot several frames. And they know their camera's behaviour in low light, with glasses, behind glass and at close distances, so they switch to the right method without hesitation.
Practical examples
The camera will not take a photo of a cupcake
- Situation
- You lean in close to a cupcake and the shutter will not fire.
- What to do
- You step back about 20 centimetres, focus again and crop slightly later.
- Why it works
- You were closer than the lens's minimum focusing distance, so it could not focus.
- Result
- The camera focuses instantly and the cupcake is sharp.
Soft eyes in every portrait
- Situation
- At f/1.8, your portraits have sharp eyelashes but soft eyes.
- What to do
- You test on a tripod with a ruler at an angle and confirm the lens focuses slightly in front on your DSLR. You use AF Microadjustment to correct it.
- Why it works
- A consistent front focus between that camera and lens was shifting the sharp zone forward.
- Result
- The eyes are now sharp, and a quick retest confirms the correction.
Key points
- A focus problem means something is sharp but not the subject, or the camera cannot focus at all.
- Most problems come from the AF/MF switch, the focus point, the AF mode or low light.
- If the shutter will not fire up close, you are probably inside the lens's minimum focusing distance.
- Front or back focus mainly affects DSLRs and can often be corrected with AF Microadjustment or Fine-Tune.
- Use a checklist, test properly, and switch to manual focus when autofocus cannot succeed.
Frequently asked questions
Why won't my camera focus?
Why is the background sharp but my subject blurry?
What is front focus and back focus?
Do mirrorless cameras need AF microadjustment?
Conclusion
Most focus problems have simple causes: a switch, a focus point, an AF mode, too little light, or being too close. Check them in order, test carefully before blaming your equipment, and use manual focus as your backup. In the final lesson of this course, you will learn how to make sure nothing else spoils the sharpness you worked for.
Finished reading? Track your progress through Focus and depth of field.