Pocket Magnifier
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Dean Reynold's Microscope Collection Powerpoint https://books.google.com/books?id=YElIAAAAYAAJ&pg=PA264&dq=camera+focus+magnifier&hl=en&sa=X&ved=0ahUKEwiN-buIjZnaAhVP4VMKHcFbAOYQ6AEIVjAI#v=onepage&q=camera%20focus%20magnifier&f=false http://www.microscope-antiques.com/focusingphoto.html