A patent for a new supertelephoto zoom optical formula for the EOS M system has surfaced in the form of an EF-M 70-400 f/4.5-7.2 STM.

Patent Publication No. 2014-228734 (Google Translated) Published 2014.12.8 Filing date 2013.5.23

Example 3 Zoom ratio 5.58 The focal length f = 69.59-251.52-388.00mm Fno. 4.68-6.30-7.00 Half angle ω = 11.11-3.11-2.02 ° Image height 13.66mm Overall length of the lens 155.01-227.97-240.02mm BF 15.81-37.15-46.87mm Inner focus



Source: [EG]

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