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Canon Patent 55-200mm IS II USM Lens

In a recent patent document we have spotted, Canon working on 55-200mm lens. The patent is very new, as usual the patent documents doesn’t contain a lot much details inside. But, we do believe that the lens will going to have NANO USM Motor as we have seen inside the Canon 70-300mm IS II USM Lens. Let’s talk in details.

The 55-200mm USM II lens is actually a successor of Highly popular EF-S 55-200mm F4.5-6.3 IS STM LensThe Canon EF-M 55-200mm F4.5-6.3 IS STM Lens Announced back on June 17 2014. The lens is hardly 4 years old but we have seen a lot of improvement in Auto-Focusing tech inside Canon DSLRs And to match the AF speed requirement of current generation of DPAF sensor and to become compatible for future DPAF and QPAF Sensor they will going to introduce Nano USM AF Motors inside the lens which we have already seen inside the Canon 70-300mm Lens. The Nano-USM based lenses silent like STM but they do a blazing fast AF, even faster than the STM version.

Canon 55-200 MM USM II Lens Patent Details

PROBLEM TO BE SOLVED: To obtain a zoom lens that is small in the whole system, has a high zoom ratio and high optical performance in the whole zoom range, and facilitates image blur correction.SOLUTION: The zoom lens is composed of, successively arranged from an object side to an image side, a first lens group B1 having a positive refractive power, a second lens group B2 having a negative refractive power, a third lens group B3 having a positive refractive power, a fourth lens group B4 having a negative refractive power, and a fifth lens group having a positive refractive power. Upon zooming, at least three lens groups move to vary intervals between adjoining lens groups. The third lens group B3 is composed of, successively arranged from the object side to the image side, a B3a group having a positive refractive power, a B3b group having a negative refractive power, and a B3c group having a positive refractive power. Upon correcting image blur, the B3b group moves in a direction having a component perpendicular to the optical axis. A focal length ft of the whole system at a telephoto end, a focal length f3 of the third lens group, and a total lens length TL at the telephoto end are each appropriately set.

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