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Thread: auto focus beam from flash gun

  1. #1

    Default auto focus beam from flash gun

    Does the auto focus beam from flash gun helps auto focus to be faster?

  2. #2

    Default Re: auto focus beam from flash gun

    Quote Originally Posted by alvinkm View Post
    Does the auto focus beam from flash gun helps auto focus to be faster?
    In a way yes... It helps the camera know what to lock on to faster, but the main benefit is it helps focus in low light.
    Alpha

  3. #3

    Default Re: auto focus beam from flash gun

    Quote Originally Posted by Rashkae View Post
    In a way yes... It helps the camera know what to lock on to faster, but the main benefit is it helps focus in low light.
    meaning if a lens is weak in low light....and focus slower....with the help of flash gun'a beam, the lens will lock on faster?.....

    if a lens is slow in focusing,does flash gun "helps the lens to focus faster"?

  4. #4

    Default Re: auto focus beam from flash gun

    No, lenses don't focus slower or faster in weak light - the main difference is that not enough light is reaching your camera's AF sensors. So this determines if your camera body knows when it's in focus or how it has to adjust the focus. The flash beam provides extra light that the camera can lock onto faster.
    Alpha

  5. #5

    Default Re: auto focus beam from flash gun

    Quote Originally Posted by Rashkae View Post
    No, lenses don't focus slower or faster in weak light - the main difference is that not enough light is reaching your camera's AF sensors. So this determines if your camera body knows when it's in focus or how it has to adjust the focus. The flash beam provides extra light that the camera can lock onto faster.
    so it helps to reduce the "hunting" of lens in low light when difficult to lock on?

  6. #6

    Default Re: auto focus beam from flash gun

    yup.
    Alpha

  7. #7

    Default Re: auto focus beam from flash gun

    oh.. Seems useful, let me go home and look for this function on my 58..
    Alpha
    Want to get back to photography

  8. #8

    Default Re: auto focus beam from flash gun

    In Youtube, I saw this guy talking about using a flash gun for low light photography.

    http://www.youtube.com/watch?v=8HDiM0ZTSrw

    Watch from 2:38 onwards

    I hope this is what you are talking about.
    Nikon D3s/D3000 / 70-200VR II F2.8 / 24-70 F2.8 / 70-300VR F4.5-5.6 / 18-55 F3.5-5.6 / SB-600 & 900

  9. #9

    Default Re: auto focus beam from flash gun

    thanks all for the enlightenment!

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