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Thursday, December 28, 2017

Recent Canon Patents On Super Telephoto Lens




As reported earlier, Canon has been working to improve its Super Telephoto lens in the past couple of years. The emphasis is on weight reduction and enhancing image quality with superior coatings and optics. Some time in 2018, the EF 600mm f/4 DO BR lens is expected to be announced.

Below are a few new patents Canon has applied for in the Super Telephoto lineup. The 2018 Winter Olympics and World Cup are coming, followed by the 2020 Olympics in Tokyo. Canon is determined to make a showcase of their products in these worldwide, headlines-grabbing events.

Japan Patent Application 2017-215495

This patent appears to be two fold, lightweight (relatively here!) with a good correction of aberrations such as axis chromatic and chromatic aberrations of due to magnification.  This element design most likely has IS, it's simply not labelled by Canon.

400mm f/2.8
300mm f/2.8
500mm f/4.0

Japan Patent Application 2017-215494

Reduction of chromatic abberrations and secondary spectra (specific type of chromatic aberrations) are reduced in this patent. This element design most likely has IS, it's simply not labelled by Canon.

400mm f/2.8
500mm f/4.0
600mm f/4.0
800mm f/5.6

Japan Patent Application 2017-215493

DIfferent technique to reduce aberrations such as axis chromatic and chromatic aberrations of due to magnification.  This element design most likely has IS, it's simply not labelled by Canon.

300mm f/2.8
400mm f/2.8
500mm f/4.0
600mm f/4.0
800mm f/5.6

Japan Patent Application 2017-215492

DIfferent technique to reduce aberrations such as axis chromatic and chromatic aberrations of due to magnification.  This element design most likely has IS, it's simply not labelled by Canon.

300mm f/2.8
400mm f/2.8
500mm f/4.0
600mm f/4.0
800mm f/5.6

Japan Patent Application 2017-215491

This application changes the element location for focus to reduce weight, and also to reduct chromatic aberrations.  This element design does not have IS, which probably makes it exploritory or defensive in nature.

400mm f/2.8
800mm f/5.6
200mm f/2.0

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