Wonderful where the DIY can bring a Japanese!
Watch this video on an “origami-lens”. It’s wonderful!
If you try with a Canon mount, let me know the result!
There are a lot of Canon lens patents on the road:
EF 35 f/1.4L II, EF 50 f/1.4 USM, EF 300 f/4L IS II, EF 24 f/2.8 USM, EF 28 f/1.8 DO. (Canon Rumors)
However at the moment we only know the new release date of the EF lens.
Click those direct links to check price and be notified when in stock:
EF 8-15mm F4 L Fisheye USM on BH
EF 300mm F2.8 L IS II USM on BH
EF 400mm F2.8 L IS II USM on BH
EF 500mm F4 L IS II USM on BH
EF 600mm F4 L IS II USM on BH