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A patent for a new EF 300mm f/4L IS has appeared. Other optical formulas appearing in the patent are 24mm f/2.8 and 50mm f/1.3 with variable diffractive index elements which help correct some aberrations (thanks Keith).
Patent Publication No. 2015-28551 (Google Translated)
- Published 2015.2.12
- Filing date 2013.7.30
|Example||Focal distance||Fno.||Half angle||Image height||Overall length of the lens||BF|
|Five||6.15 20.45 71.28||2.88 3.71 3.69||30.34 9.98 2.89||3.60||84.11 86.12 90.41||11.74 15.68 8.50|