I do believe magnifiers vary in quality, though I'm not sure how this works.
I had a low vision specialist once show me two magnifiers that were both 10x
power, but I was not able to see the print with one and was able to see it
with the other. He said the difference was the optics, and of course the one
that was better was much more expensive, by several hundred dollars. So I do
think price makes a difference in quality, which could affect the resulting
image quality.

Do you mind mentioning which company you bought it from? I'm just curious.

Jen