Tamron 18-400mm
It wouldn’t have been possible not so very long ago, but Tamron has managed to shoe-horn the 18-400mm focal range into a zoom lens that measures around 12 centimetres in length and weighs a shade over 700 grams.
The new Tamron 18-400mm f3.5-6.3 Di II VC HLD zoom is designed for use with ‘APS-C’ format D-SLRs which means the effective focal range is 27-600mm on a Nikon ‘DX’ body and 29-640mm on a Canon EF-S mount body. It’s the world’s first ‘ultra zoom’ – the zooming ratio is 22.2x – and it’s packed with Tamron’s latest lens tech, including two moulded aspherical elements, a hybrid aspherical element and three low-dispersion types. The optical construction comprises 16 elements in 11 groups. 
Tamron 18-400mm
The 18-400mm zoom also employs an ‘High/Low Torque Modulated Drive’ (HLD) for fast autofocusing and ‘Vibration Compensation’ (VC) optical image stabilisation which gives up to 2.5 stops of correction for camera shake. The minimum focusing distance is 45 centimetres which, at 400mm, gives a maximum magnification ratio of 1:2.9. The minimum aperture range is f22-40, and the screwthread filter fitting is 72 millimetres. The barrel is sealed against the intrusion of dust and moisture and both the Canon and Nikon mount versions have an electromagnetically-controlled diaphragm with seven blades.
The new Tamron 18-400mm f3.5-6.3 Di II zoom is priced at $999.
More information is available at www.tamron.com.au