This explains how Fresnel Lens focal lengths apply to X magnification and how the size of the collector determines the power concentrated to your project, not the magnification rating.
Here is a review of a screen magnifier for smartphones by Dizual. It does make the screen bigger however the product seems cheaply made and your phone will fall off …
A short informational video on how to enable and use the magnifier feature in iOS 10. Please like, sub, share if you find this video helpful! Thank you. FACEBOOK: INSTAGRAM: …