All your questions answered. Send your questions to digitalcamera@futurenet.com

Our comprehensive listing of key specifications for DSLR lenses

This month: Improve composition Compose yourself for photographs that are worth looking at more than once

This chunky lens is a terrific telephoto prime with an exhilarating turn of speed www.sigmauk.com

Master creative use of long exposure to capture the dynamics of nature, says Karolina Konsur

Tim Irwin’s 3D printed 90mm lens is a whole lot better than it looks, says Damien Demolder , and it produces some useful, and fun, results