Autofocus


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noelle

New Member
Aug 7, 2007
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#1
Another newbie q...

Sometimes, not all the time, when I use AF instead of Manual, the lens zooms in and out, refusing to take the picture... Can someone tell me what's happening or what I'm doing wrong?

Find it really annoying and sometimes embarrassing when I'm standing next to someone and they can hear the lens going in and out... :embrass: Because of this, I usually resort to using Manual focus but I would like to try using AF since seems like AF is the preferred option for most people...
 

LiOnElLiN

Senior Member
Apr 18, 2004
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www.zelesjen.com
#2
AF requires sufficient light and contrast for it to work.
can you describe your situation please?


Another newbie q...

Sometimes, not all the time, when I use AF instead of Manual, the lens zooms in and out, refusing to take the picture... Can someone tell me what's happening or what I'm doing wrong?

Find it really annoying and sometimes embarrassing when I'm standing next to someone and they can hear the lens going in and out... :embrass: Because of this, I usually resort to using Manual focus but I would like to try using AF since seems like AF is the preferred option for most people...
 

catchlights

Moderator
Staff member
Sep 27, 2004
21,903
46
48
Punggol, Singapore
www.foto-u.com
#3
Like what LiOnElLiN said,

you can't lock your AF on a white wall or a dark sky, so you need to find something has line or texture at the same distance as the subject, once AF locked, recompose your frame.
 

noelle

New Member
Aug 7, 2007
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#4
i see...

off the top of my head, some situations:.
- shooting scenery with blue sky as catchlights mentioned
- shooting school fashion show - was held at night in school hall i guess as suggested by LiOnElLiN because of low lighting
- also sometimes when the object i'm shooting is close to me

in such instances, do i just use Manual Focus then? :)
 

night86mare

Deregistered
Aug 25, 2006
25,541
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www.pbase.com
#5
ya, when there is no contrast, i.e. the surface you are attempting to focus on or object is uniform, af won't work
same when there is no light

then you might want to place something with contrast on your af points, which is why certain bodies are not very favoured, not enough af points (unlike k100d, coughhackcough).. if that fails because you don't like the resultant composition, then have to manual focus

for the object too close, might have something to do with minimum focusing distance
go explore slrgear.com
they will have the minimum focusing distance listed under specifications
 

noelle

New Member
Aug 7, 2007
56
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#6
thanks guys! think i understand now..
 

bedrock

New Member
Jun 29, 2003
154
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#7
if the moment is not going to be there for long usually i switch to manual focus and focus it and then take a shot. after that remember to switch back to AF. :)
 

xunjas

Senior Member
Dec 28, 2006
6,494
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0
Singapura
www.isaackiat.com
#8
Another newbie q...

Sometimes, not all the time, when I use AF instead of Manual, the lens zooms in and out, refusing to take the picture... Can someone tell me what's happening or what I'm doing wrong?

Find it really annoying and sometimes embarrassing when I'm standing next to someone and they can hear the lens going in and out... :embrass: Because of this, I usually resort to using Manual focus but I would like to try using AF since seems like AF is the preferred option for most people...
use MF is the right move =)
 

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