Canon's fourth 'hybrid' f/1.4 prime lens joins the 24mm, 35mm and 50mm Versatile 20mm wide-angle perspective and fast aperture List price is £1,919.99 (US and Australia pricing plus sales start ...

The magnifier uses a variety of components [Ad_w00000] had lying around. For the optical side of things, an old Canon DSLR zoom lens was pressed into service as the main magnifying element.

From the hand-held magnifying lenses used by Italian artists and scholars in the 13th Century, to the invention of bifocal lenses by American statesman and inventor Benjamin Franklin in 1784 ...