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Why Macro Mode



 
 
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  #1  
Old December 23rd 10, 04:29 AM posted to rec.photo.digital
Dave Cohen
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Posts: 841
Default Why Macro Mode

This might seem like a silly question, but I recently got a Canon
A3100IS which seems to do very well in macro mode. At some point I
discovered you can't select macro mode when set on auto, when you get
too close the camera displays the macro symbol and works fine.
Experimenting further, I find in P mode you can take perfectly good
macro shots without selecting macro mode and you can leave it in macro
mode and shoot well beyond the macro range (but not too far out, like
across the room).
Since I'm having problems with no viewfinder but love the size I might
get a Panasonic DSC-FZ35 as an alternate. Reading the manual, it seems
that too detects macro distance when in IA mode.
So, what exactly does that macro setting do. If I recall correctly, on
the old SLR systems, the macro ring physically moved something within
the lens to change the geometry.
  #2  
Old December 23rd 10, 06:07 AM posted to rec.photo.digital
Paul Furman
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Posts: 7,367
Default Why Macro Mode

Dave Cohen wrote:
This might seem like a silly question, but I recently got a Canon
A3100IS which seems to do very well in macro mode. At some point I
discovered you can't select macro mode when set on auto, when you get
too close the camera displays the macro symbol and works fine.
Experimenting further, I find in P mode you can take perfectly good
macro shots without selecting macro mode and you can leave it in macro
mode and shoot well beyond the macro range (but not too far out, like
across the room).
Since I'm having problems with no viewfinder but love the size I might
get a Panasonic DSC-FZ35 as an alternate. Reading the manual, it seems
that too detects macro distance when in IA mode.
So, what exactly does that macro setting do. If I recall correctly, on
the old SLR systems, the macro ring physically moved something within
the lens to change the geometry.


It probably shortens the focal length, which makes it easier to focus
close, and also extends the lens like any focusing action would do as
you focus closer. If you can get decent closeups without being in macro
mode, that's probably because the depth of field is so large that it's
still good enough but that will cost resolution if you are stopped down
too much (large number f-stop).
 




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