The Canon RF 200-800mm f/6.3-9 IS USM is the reigning superzoom champion in terms of focal range and is impressively lightweight and compact for its reach. However, its mediocre maximum aperture does ...

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Sixth People’s Hospital, School of Medicine & School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, P. R. China Centre for Personalized Nanomedicine, Australian Institute ...