Canon Patent For 400mm, 600mm and 800mm Telephoto Lenses With Diffractive Optical Elements

Hi Lows Note spotted a Canon patent application (2019-028317) for 400mm f/4, 600 mm f/4, and 800 mm f/5.6 telephoto lenses with DOE (Diffractive Optical Elements).

Focal distance 582.00 
F number 4.12 
Half field angle (degree) 2.13 
Image height 21.64 
Whole length of the lens 394.25 
BF 62.79 

Focal distance 405.00 
F number 4.12 
Half field angle (degree) 3.06 
Image height 21.64 
Whole length of the lens 330.16 
BF 50.46 

Focal distance 795.00 
F number 5.60 
Half field angle (degree) 1.56 
Image height 21.64 
Whole length of the lens 490.24 
BF 105.13 

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production in the next few years are these:

• Patent application describing the optical formula for a RF 70-300mm F/4-5.6 IS lens for EOS R systems
• Patent application describing how to improve burst rate by compressing raw files
• Patent application describing a new way to review photos from a sequential shot
• Patent application that describes technology to improve wireless communication while reducing power consumption
• Patent application to spot and reduce moire artefacts in image data
• Patent application for weather sealed lens adapter
• Patent application for AI powered predictive camera control system
• Patent application for 18-55mm kit lens with LCD display
• Patent application to reduce noise in image files