Images not sharp
There are many factors for images not being sharp and exhibiting in many ways.
Camera
Dust on the mirror or A/F sensor |
Wrong custom settings |
Using the wrong focus bracket |
User movement |
Low light shooting conditions |
Focus screen, mirror, bayonet mount or sensor out of alignment |
Worn mirror box causing shutter bounce |
Tough subject for the auto focus to lock on to |
Camera needs to have a focal calibration |
Incorrect fine tune set up |
The eyesight diopter is incorrect for your eyesight making it look blurry though the eyepiece |
You are too close to the subject |
Also see lens focus issues