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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