The problem occurs in parts of the image where you can see much brighter points than the background that surrounds them.
In short:
- - It can happen anywhere in the image (center, corners, ...).
- It resembles a coma, always presenting itself in the shape of a cross.
- Apparently, none of the images that make up the stack presents a similar problem.
Picture taken with a very simple setup: Nikon D850 in Full Frame Mode and Lomo 3.7x NA 0.11 with a 125mm extension from base lens to sensor plane.
Final Zerene Stacker PMAX image without any kind of post processing, where the affected area is marked:
Cropped area (100%) with some artifacts marked an example, you can see quite a few more, and there are other in various locations of the image:
In the next animation, we can see the evolution of the stack and suggest that the effect is due to a "movement or stretching of the focused / bright area" between the images:
----
EDIT: In doubt, I ended up replacing the link with an image with less stacks in order to comply with the 300kb rule and so it is immediately available showing what is intended.
Does anyone have an idea of what might be happening?
If it is not a problem exclusively from my optical setup, can I do something to avoid or minimize it?
I hope I was clear in my exposition.
All comments, suggestions or explanations are welcome.
Best regards,
Carlos Magno