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Canon patent for EF 600mm f/4 IS DO lens

That may become a killer lens if it ever goes to production. Canon files a patent for a n EF 600mm f/4 IS DO lens. "DO" stays for diffractive optics. Will…

Canon Patent For 400mm f/4 IS DO Lens

Egami (translated) spotted a patent filed by Canon for a 400mm f/4 IS DO (diffractive optics) lens. Patent Publication No. 2014-109700 Publication date 2014.6.12 Filing date 2012.12.3 Example 1 Focal…

Canon Patent For 400mm f/4 DO Lens

Egami (translated) spotted another patent filed by Canon. It is for a 400mm f/4 lens with diffractive optical elements (to reduce flare). Patent description (machine translated): Patent Publication No. 2013-64858…

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