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[OM] Re: Focus stacking

Subject: [OM] Re: Focus stacking
From: Rand E <rtomcala@xxxxxxxxxxx>
Date: Wed, 30 Apr 2008 18:38:20 -0400
Chuck,
As far as the different magnifications go, I would guess that you would 
have to focus by moving the camera rather than changing the focus on the 
lens.
    Rand E.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Chuck Norcutt wrote:
> Quite some time ago I downloaded some free software that does image 
> stacking ("CombineZM" by Alan Hadley) but never tried to use or study 
> it.  CombineZM can be used to stack images for improved depth of field, 
> add exposures (as in astrowork), increase dynamic range, etc. (yes, 
> there's more)
> 
> Today I noticed the beautiful blossoms on a crabapple tree so snipped 
> off a small branch and setup indoors to take a series of shots with a 
> Viv Series 1 90/2.5 macro intending to get all of the blossoms in focus 
> across the full width of the branch.  I ended up with a set of 7 frames 
> each focused about an inch apart.  I started to peruse the instructions 
> which seemed rather daunting so decided simply to press ahead and see if 
> I could find the automated procedures.  I did but they made a perfect 
> mess of the result.
> 
> First, I knew that changes in focus were going to cause slight 
> differences in magnification.  But I was surprised to see just how much 
> the magnification does change.  Across the full 7 frames the image 
> shrank about 3-4%.  When I directed the software to do it's thing I 
> ended up with a series of overlaid images all of slightly different 
> size.  Not what I expected.  I guess I may be forced to read the 
> instructions to figure out how to resize the images for a precise overlay.
> 
> Finally, and I don't know how I'm going to defeat this part, I noticed 
> that over the 7 minutes I took to take the 7 shots that several blossoms 
> visibly wilted during the session and sagged on their stems by roughly 
> their own full width in the 7 minute session.  Guess I'm going to have 
> to get faster.
> 
> Anyhow, anyone have any experience in doing this sort of thing.  Any advice?
> 
> Thanks,
> Chuck Norcutt

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