Failure archive
Turn an unsatisfactory photograph into a testable explanation rather than a guessed diagnosis.
GUIDED LESSONStart here
Use this lesson when a file is soft, blurred or otherwise different from what you intended. Start with what is visible, propose competing causes and change one thing in a repeat.
By the end: Write one specific observation, two possible explanations and a repeat that can tell them apart.
What you need: An original image and its capture settings. If you cannot repeat the scene, complete the supplied case and mark your own explanation as untested.
Before you begin: Photography foundations: sharpness decisions. Keep the original file and its settings.
How to work through this lesson
- Inspect the original at a useful scale. Describe which edges are sharp or blurred and where, without naming the cause yet.
- List two plausible causes and the evidence each predicts. A sharp background with a soft subject suggests a different test from blur across the whole frame.
- Change one relevant condition in a repeat, compare the result and keep both files. If you cannot repeat it, record what evidence is missing.
Turn an unusable image into a diagnosis
A failure record should separate evidence, candidate causes and the next test. 'Blurry' is an observation category, not a diagnosis. Look at stationary detail, moving detail, the plane of best focus and any directionality in the blur.
Change one variable in a repeatable scene. If the whole frame has similarly directed streaks, camera movement is a candidate. If stationary objects are sharp while the moving subject streaks, subject motion is a better candidate. If another distance is sharp, examine focus placement.
Worked example
Synthetic case: a street sign is crisp, a walking person is smeared, and the exposure is 1/15 second. Start by testing a shorter exposure while maintaining similar brightness. Do not start by cleaning the sensor or buying a lens: neither addresses the evidence. Save both frames and write whether the person’s outline improved.
Try it yourself
Write your answer before opening the explanation. Use the worked example if you get stuck.
Question 1
Your close subject is soft but a chair behind it is sharp. Give a likely cause and a test that distinguishes it from camera shake.
Show answer and reasoning
Focus may have landed behind the subject. Focus deliberately on the subject, support the camera and repeat. Improvement at the intended distance supports a focus-placement explanation. It is not proof unless the comparison controls movement and settings.
Watch for: A single compressed preview may hide the relevant detail. Inspect the original at a comparable viewing size, and retain uncertainty when several causes fit.
Summary + next step
Write one specific observation, two possible explanations and a repeat that can tell them apart.
Keep the result: Keep the original, settings, proposed causes, test and result together in a short diagnostic note.
Sources and further reading
Read these references for the concepts used in the lesson.
Lesson updated 2026-09-14 · Guidance updated 2026-10-22
Coverage and further development
Write one specific observation, two possible explanations and a repeat that can tell them apart.
Further development: Owner-submitted failure photographs with annotated evidence and confirmed repairs.