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Question on depth of field



 
 
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  #1  
Old March 13th 12, 02:58 AM posted to rec.photo.digital.slr-systems
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Default Question on depth of field


I have identified 4 things to increase DOF...

1 smaller aperture (higher f/ #)

2 smaller focal length (a 60mm gives more DOF than a 105mm)

3 greater camera to subject distance

4 print smaller or view smaller size


Before I continue is this correct?

If so, than maybe moving back and getting a smaller image on sensor could be
offset by using a high pixel count camera (24 or 36mp) and then cropping out an
equivalent picture of say 8mp...

In other words, instead of filling the screen with a butterfly, make it less
than half or quarter the frame and crop it.

Am I missing anything? (assuming I'm happy with an 8mp photo.) Would cropping
it up in size change the DOF? (I think it would but I'm wondering if I can win
here! With my luck it'll even out.)

  #4  
Old March 14th 12, 01:21 AM posted to rec.photo.digital.slr-systems
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Default Question on depth of field

On Tue, 13 Mar 2012 15:34:25 -0500, David Dyer-Bennet wrote:

writes:

I have identified 4 things to increase DOF...

1 smaller aperture (higher f/ #)

2 smaller focal length (a 60mm gives more DOF than a 105mm)

3 greater camera to subject distance

4 print smaller or view smaller size


Before I continue is this correct?

If so, than maybe moving back and getting a smaller image on sensor could be
offset by using a high pixel count camera (24 or 36mp) and then cropping out an
equivalent picture of say 8mp...

In other words, instead of filling the screen with a butterfly, make it less
than half or quarter the frame and crop it.

Am I missing anything? (assuming I'm happy with an 8mp photo.) Would cropping
it up in size change the DOF? (I think it would but I'm wondering if I can win
here! With my luck it'll even out.)


Yes; filling the partial frame and cropping it later amounts to greater
enlargement, so it counts under your #4.



Damn! But thanks!

  #5  
Old March 14th 12, 01:22 AM posted to rec.photo.digital.slr-systems
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Posts: 210
Default Question on depth of field

On Wed, 14 Mar 2012 10:44:58 +1300, Me wrote:

On 13/03/2012 2:58 p.m., wrote:

I have identified 4 things to increase DOF...

1 smaller aperture (higher f/ #)

2 smaller focal length (a 60mm gives more DOF than a 105mm)

3 greater camera to subject distance

4 print smaller or view smaller size


Before I continue is this correct?

If so, than maybe moving back and getting a smaller image on sensor could be
offset by using a high pixel count camera (24 or 36mp) and then cropping out an
equivalent picture of say 8mp...

In other words, instead of filling the screen with a butterfly, make it less
than half or quarter the frame and crop it.

It won't work.
Am I missing anything? (assuming I'm happy with an 8mp photo.) Would cropping
it up in size change the DOF? (I think it would but I'm wondering if I can win
here! With my luck it'll even out.)



There's a method to increase DOF by using multiple exposures focused in
appropriate increments and "focus stacking" software to combine the
images. Practically limited to static subjects using a tripod and with
controlled lighting, but very effective.


I knew it... thanks for the tip... I'll have to try that out.

 




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