Focus
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Focus. On how to get a sharp picture. Outline. Focus mechanism Focus type Focus drive Final notes. Focus mechanism. Sensor Phase detection Contrast measurement Control system Motor Internal external. Focus type. Manual Auto Single point Auto point detection

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Focus

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Focus

Focus

On how to get a sharp picture


Outline

Outline

  • Focus mechanism

  • Focus type

  • Focus drive

  • Final notes


Focus mechanism

Focus mechanism

  • Sensor

    • Phase detection

    • Contrast measurement

  • Control system

  • Motor

    • Internal

    • external


Focus type

Focus type

  • Manual

  • Auto

    • Single point

    • Auto point detection

      Caution: Not all lenses are all-time focus


Focus drive

Focus drive

  • Single shot (AF-S)

  • Al-servo (AF-C)

  • Al-focus (AF-A)


Final notes

Final notes

  • DEPTH and DIFFICULTY of Focus: DOF

  • Hyper focal distance

  • Sharpness is not only dependent on the focus

    • Shutter speed

    • Lens quality at different appertures


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