auto focus

  1. T

    PTZ zoom / focus mechanism

    How do the PTZ cameras maintain such crisp focus while zooming? They don't use parfocal lens right? So are they continuously updating the focus motor as they zoom?
  2. K

    How to manually focus for multiple presets

    I have an outdoor PTZ camera (Dahua SD50225UN-HNI) with 3 different presets. The focus is currently set to manual, as auto-focus has a difficult time deciding what to focus on. Manual focus works okay for 2 presets that are at approximately the same distance, but it is completely out of focus...
    • kylejohnson
    • Thread
    • auto focus dahua focus manual focus preset ptz
    • Replies: 1
    • Forum: Dahua
  3. N

    motorized Varifocal vs zoom vs auto focus cameras...What's the diff?

    Maybe another in my list of noob questions that should be obvious but isn't for me... What is the difference between "motorized Varifocal", "auto focus" and a zoom cameras? ( I get the full PTZ difference of course.) My first cams were all fixed focus, I think 2.8mm. I quickly realized that...
    • nbstl68
    • Thread
    • auto focus ptz camera varifocal zoom
    • Replies: 3
    • Forum: IP Cameras
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