Probably it is not your software, but your lens. The popular thing to
do with macro design these days is to change focal length with focus.
I think it helps with that whole dual purpose idea. You know, sharp at
distance and up close. Your results will probably be fine if you have
an older macro without built in focus compensation element like the
old OM 80/4.
Winsor
Long Beach, California, USA
On / April 30, 2008 CE, at 3:05 PM, 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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