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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

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

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

A not-so-standard, standard prime for full-frame Nikon and Sony mirrorless cameras www.viltrox.co.uk