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Affinity Photo - Stack seems to ignore sharpest images


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Situation: stack of 52 images, static subject, used focus rail to achieve focus with increasing sharpness to objects/edges farther away

Camera: Nikon D5100 with El-Nikkor 50mm (enlarger) lens mounted backward at f/5.6, 1/20 second.

Affinity Photo 1.10.0.1127

Since I know little about stacking in Affinity Photo, I used only defaults. 

The stacked result is soft (photo with center in focus), while for example, the sharpest petals surrounding the dahlia center (photo with unsharp center) is found on one of the middle images in the stack.

I experimented with the various types of stacking but did not find one that appeared to actually select the sharpest petals consistently.

How can I achieve that sharp-sharp focus stack result?

 

_DSC0153-med.jpg

Dahlia2-50JPGS-med.jpg

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Are you trying to do a Focus Merge? That is different from a Stack.

They are both in the File menu. File > New Stack... or File Focus Merge ...

Mac Pro (Late 2013) Mac OS 12.7.4 
Affinity Designer 2.4.1 | Affinity Photo 2.4.1 | Affinity Publisher 2.4.1 | Beta versions as they appear.

I have never mastered color management, period, so I cannot help with that.

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21 minutes ago, Old Bruce said:

Are you trying to do a Focus Merge?

Why, yes I am.

I shouldn't jump on the first menu item with the special word (stack). I shouldn't jump on the first menu item with the special word (stack). I shouldn't jump on the first menu item with the special word (stack). I shouldn't jump on the first menu item with the special word (stack). I shouldn't jump on the first menu item with the special word (stack)....

If I were to select the right activity, that might improve things...

😔

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