I am pretty sure that this jumping spider spiderling (or maybe just a jumping spiderling?) is the smallest thing I’ve ever taken a picture of.
Konica Minolta Pro Automatic 35mm F2.8 Lens reverse-mounted with 36mm extension tube on a Canon T1i Rebel
ISO 100 at f/22, 1/160 sec
Diffuse flash in whitebox
Image editing in Adobe Photoshop CS5