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

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

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

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

Our comprehensive listing of key specifications for DSLR lenses

Short, fast, apochromatic refractors with a flat image field that don’t cost a king’s ransom are perhaps the Holy Grail of telescope design. Altair Astro’s 60EDQ f/5 quad astrograph with dual-ED optic