A soft photograph does not automatically need more sharpening. The camera may have moved during the exposure, focus may have landed on the background, or only the person being photographed may have moved. These causes need different corrections when you take the next picture. Start with the original file rather than a reduced messaging-app copy, and inspect several areas at 100 percent.
Read the shape of the blur
Camera shake often leaves short streaks, doubled outlines or smeared edges pointing in a similar direction. Look for stationary details: window frames, lettering on a sign or the edge of a lamp. Similar distortion in these objects across the frame suggests camera movement. The pattern need not be identical everywhere; rotation can leave stronger traces near the edges than at the centre.
With missed focus, edges tend to spread softly rather than stretch clearly in one direction. The useful question is whether another plane in the picture is sharp. If a portrait shows ears or the wall behind the person more clearly than the eyes, focus probably landed at the wrong distance. A soft background alone is not a fault: it may be the intended result of shallow depth of field.
When only the subject smears
A sharp door frame beside a blurred hand points towards subject movement. Inspect more than the face: hair, fingers or feet can move during an apparently still pose. Conversely, deliberate panning can leave the subject comparatively sharp against a smeared background. Read the appearance together with the circumstances of the photograph.
Optical stabilization compensates for camera movement, not a person moving within the picture. Switching it on therefore does not automatically permit longer exposures for children, animals or gestures. Camera shake and subject movement can also happen together. If neither background nor subject is sharp, one photograph may not contain enough evidence to identify the cause confidently.
A comparison that separates the causes
In good light, choose a stationary subject with fine contrast, such as an upright package. Stay beyond the lens’s minimum focusing distance. Place a single focus point on an identifiable edge and check focus confirmation. Keep distance, focal length and aperture unchanged for the comparison.
Take one photograph handheld, then another with the camera firmly supported and a self-timer. Follow your model’s instructions for stabilization on a tripod. If only the supported picture becomes distinctly sharper, camera shake is a reasonable suspect. Also make a frame with a substantially shorter exposure; raise ISO if necessary to keep brightness comparable.
If the wrong distance remains sharp, deliberately change the focus point or check focus using magnified live view. For moving subjects, subsequently test continuous autofocus and a shorter exposure separately. Note just the setting changed each time. The sequence then reveals which adjustment actually helps instead of concealing several causes at once.
