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    Canon already working on an RF 70-200mm f/2.8 Mark II lens with internal zoom?

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  • It was only October when the lens went uncovered by .

    The current model RF 70-200mm f/2.8L IS USM is like many zoom lenses. When you500vip彩票安卓下载官网 spin the focal length dial one way, the lens gets longer and when you500vip彩票安卓下载官网 spin it the other way it gets shorter. This new patent shows a design that would allow it to remain the same length throughout the zoom range. They also show off designs for an f/4 version, too.

     

    The specs for the f/2.8 version of the lens show that it would be significantly longer than the 146mm (at its smallest) of the current model. It would see an increase of around 82mm in length, although it would remain that length at all times.

    Canon RF 70-200mm f/2.8L

    Yes, 228.54mm long. That’s pretty substantial. For comparison, the lens for DSLRs is 199mm long. The is 202.5mm long. It is pretty close in length, though, to the , at 220mm. The part of the patent describing a Canon RF 70-200mm f/4.0L lens, though, isn’t much smaller, surprisingly.

    Canon RF 70-200mm f/4.0L

    While there’s no clear optical advantage to a lens with an internal zoom, there are some mechanical benefits. Although more complex to design, internal zoom lenses have fewer externally moving parts, which means they can be built with better dust and weather sealing – important factors for sports, wildlife and many other photographers.

    The patent doesn’t mention weights that I can see – which is understandable. How can you500vip彩票安卓下载官网 know the weight of something until you500vip彩票安卓下载官网’ve actually built it and popped it on a scale? So, exactly how they will compare to existing options is unknown, although I can’t imagine they’ll be all that different from their EF counterparts, given the length.

    If you500vip彩票安卓下载官网 want to read the patent in full, you500vip彩票安卓下载官网 can .

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    About John Aldred

    John Aldred is based in Scotland and photographs people in the wild and animals in the studio.

    You can find out more about John on and follow his adventures on and .

    500vip彩票安卓下载官网

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