What is the max magnification of 0.5mm film lens.

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SUMMARY

The maximum magnification of a 0.5mm film lens is not definitively established due to its dependency on the lens's radius of curvature. The discussion highlights that a Fresnel lens can be utilized on top of the film to enhance magnification. A reference to the magnification formula and the concept of substituting spherical lenses with stepped lenses is provided for further understanding. For precise calculations, users are encouraged to consult the linked resources that detail these principles.

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MJ Lee
What is the max magnification of 0.5mm film lens.

Film is just on the top of flat object(Paper, Display, Picture, etc).
If Fresnel lens is made on top of the film, Can I magnify the object?

Thank you.
 
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The way a 'film' lens depends on the radius of curvature of the lens from which it was developed so you cannot have a definitive answer to your question. See this link. which shows how a spherical lens can be substituted with a stepped (thin) lens.
There is a reference to fresnel page magnifiers in this link. and the magnification formula is there.
 
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