Canon Updates Both Its L 70-200mm Zooms
both its L Series 70-200mm zooms – the f2.8 and f4.0 speed models – an upgrade to improve both optical performance and the operational convenience.
The new EF 70-200mm f2.8L IS III USM has a sealed barrel construction against dust and moisture, complemented by new fluorine coatings on the exposed surfaces of both the front and rear elements which makes them easier to clean. It also has Canon’s latest ‘Air Sphere Coating’ (ASC) which is a new anti-reflective technology designed to minimise both reflections and flare. The ‘Air Sphere Coating’ reduces the speed that light travels through the air-to-glass so there is not such a large change in speed when the light enters through the glass thereby preventing the cause of visible ghosting and flare. In turn, this helps optimise contrast and colour saturation.
The optical construction comprises 23 elements in 19 groups which includes five fluorite and five ultra-low dispersion (UD) types to minimise various aberrations. The minimum focusing distance is 1.2 metres and autofocusing is performed via Canon’s ‘Ring USM’ ultrasonic drive. The minimum aperture is f32 and the diaphragm has eight blades to help create smoother out-of-focus effects.
The new EF 70-200mm f4.0L IS II USM model is a more compact and lightweight lens, weighing in at a very manageable 780 grams (although this is still marginally heavier than the previous model). Its optical construction comprises 20 elements in 15 groups (including one fluorite and two UD types), and employs Canon’s ‘Super Spectra Coating’ (SSC) to minimise ghosting and flare. The minimum focusing distance is one metre. The f4.0 speed lens also has weathersealed external construction with fluorine coatings on the exposed element surfaces to help better repel both moisture and grease.
The Mark II zoom’s optical image stabiliser has been given increased effectiveness so that it now provides correction for up to five stops of camera shake, compared to the previous model’s three stops. Canon says it’s also quieter than before.
The autofocusing drive also gets a boost in performance from a third-generation ‘EF engine’ which incorporates a higher-speed CPU and newly-developed firmware which is claimed to enhance both the speed and accuracy. Drive is via Canon’s ultrasonic ‘Ring USM’ motor.
For more information about Canon’s L series lenses visit www.canon.com.au