Mount the Brinno Digital Peephole viewer on your home door, and it allows you to examine whoever knocks on your door on its 1.3 megapixel display. It also allows me to write bad puns in the headline. Outside it looks like a normal peephole. Inside, the $160 device gives you two kinds of view: Regular and zoomed, which can be switched with a single front button. According to the manufacturer, it runs on two batteries for up to 1700 peeps.

Over at Instructables, user Banjomaster shows how to make a fisheye lens for his Nikon D90 for just $16, with the help of one of those wide-angle doorway peephole lenses. The image associated with this post is best viewed using a browser. It looks like a pretty simple mod, both in materials required and construction method: It only needs a couple pieces of particle board, the aforementioned peephole lens, the spare lens shield that came with his camera, and of course some duct tape. The only possible caveat: The replacement wide-angle lens is significantly smaller than the camera’s lens, so there’s a circle around all of the shots. On the other hand, it’s sort of cool; it makes everything look like you shot it through a hotel door.