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strange grid effect

Posted: 04.06.2020 08:35
by clarecollins
I am doing a trial of Helicon for focus stacking. This week I did a photo session where I shot some peony flowers using the focus bracketing in my Fuji XT3 camera then stacked the images in Helicon. I took 7 fairly different compositions, all in RAW.

All the results from Helicon look brilliant at first sight but have a strange grid effect when you zoom in which isn't there in the individual images. The appearance is like a canvas texture overlay

Please can you explain this and tell me how to avoid it.

Please find attached example of the problem
Thank you
Clare