auto focus beam from flash gun


alvinkm

New Member
Dec 4, 2008
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#1
Does the auto focus beam from flash gun helps auto focus to be faster?
 

Rashkae

Senior Member
Nov 28, 2005
19,105
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#2
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.
 

alvinkm

New Member
Dec 4, 2008
127
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#3
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"?
 

Rashkae

Senior Member
Nov 28, 2005
19,105
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#4
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.
 

alvinkm

New Member
Dec 4, 2008
127
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#5
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?
 

Dec 11, 2010
948
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#7
oh.. Seems useful, let me go home and look for this function on my 58..
 

alvinkm

New Member
Dec 4, 2008
127
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#9
thanks all for the enlightenment!
 

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