Ugly Hedgehog - Photography Forum
Focus stacking question
Mar 6, 2012 07:58:21   #
ngc1514 Loc: Atlanta, Ga., Lancaster, Oh. and Stuart, Fl.
 
It appears that the automated focus stacker shown in another thread on here achieves focus by moving the camera and lens closer or farther from the subject.

How does this affect the image scale and, if the change is objectionable, how is the different image scale handled? Does the focus stacking software automatically resize each image to keep image scale constant?

I downloaded the PDF books recommended by another user, but haven't read 'em yet. (Yeah, I know... RTFM).

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Mar 6, 2012 12:23:10   #
ShooterOR
 
ngc1514 wrote:
It appears that the automated focus stacker shown in another thread on here achieves focus by moving the camera and lens closer or farther from the subject.

How does this affect the image scale and, if the change is objectionable, how is the different image scale handled? Does the focus stacking software automatically resize each image to keep image scale constant?

I downloaded the PDF books recommended by another user, but haven't read 'em yet. (Yeah, I know... RTFM).


I don't use the automated method, I manually move the plane of focus by moving the camera on a focusing rail. I believe the changes in scale are handled by the software. A related issue is when one uses this methodology for achieving greater focus in a landscape. This requires the focus point to be made by using the focusing ring on the lens. This change is image size must be done by cropping final stacked landscape. What this requires is planning the original images to be stacked to leave cropping room in those images. (Since I learned to "fill the frame" to maximize small negative/transparency size, this was an early mistake.) Hope this answers your question.

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Mar 6, 2012 21:01:41   #
Jambulee Loc: San Antonio del Mar,Tijuana,Mex
 
ngc1514 wrote:
It appears that the automated focus stacker shown in another thread on here achieves focus by moving the camera and lens closer or farther from the subject.

How does this affect the image scale and, if the change is objectionable, how is the different image scale handled? Does the focus stacking software automatically resize each image to keep image scale constant?

I downloaded the PDF books recommended by another user, but haven't read 'em yet. (Yeah, I know... RTFM).


I move the camera first as well as the focal distance then the focus ring to see when the everything is sharp at the farthest and closet point on the subject. 1) move the camera 2) focal distance 3) focus ring until it all comes together. Once you have the front and back points marked on your lens then shoot from front to back, don't worry about the scale the software does the work.

here is my latest using manual extension tubes on my Canon 18-135 EFS IS.

Green Pepper 2c
http://www.lightrays-photography.com/LittleThings/Focus-Stacked/i-dvh8Mdp/0/L/Green-Pepper-2c-flat-L.jpg

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