You can’t beat a good DIY crazy camera and they don’t get much crazier than this. Built by Matt at DIY Perks, this particular camera features a 432mm f/5 episcope lens with an image projection circle of around 500mm in diameter. To give you some idea of scale, your average full-frame lens has an image projection circle with a diameter of at least 43mm. That’s an area of 0.015 square meters. This lens has an image circle of 0.785 square metres (~50x the size).
And with this huge projection also comes a big advantage when it comes to depth of field. Despite being a 432mm f/5 lens, it offers the equivalent field of view and depth of field as a 35mm lens would on a full-frame camera if it had a maximum aperture of f/0.4. The closest lens to this designed for the relatively small full-frame format is the Zeiss 50mm f/0.7, and the last one of those to sell was rumoured to fetch around $200,000.