Feeling frustrated by flashguns? Misfiring autofocus making you anxious? Send your technique and camera questions to digitalcamera@futurenet.com

£1,400/$1,498

£799/$999

Sigma calls its latest superzoom ‘the ultimate all-in-one zoom lens’, but can a 10x zoom be an ultimate anything, asks Damien Demolder

This hybrid prime rounds out a series that includes 20mm, 24mm, 35mm and 50mm optics. Angela Nicholson investigates if it’s the perfect portrait lens

£6,840/$8,895 (body only)