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Canon patent of 24-70mm F2.8
Canon applied for a patent about 24-70/2.8 lens. A lens on behalf of Company Canon will be finally changed the model of.
日本語ページはこちら(Japanese page is here.)
patent:24-70mm F2.8
existing article:EF24-70mm F2.8L USM(2002)
- Patent Publication No.2010-243636
- published 2010/10/28
- filled 2009/04/02
- Embodiment1
- focal distance 24.54-66.07mm
- Fno=2.91-2.92
- angle of view 82.8-36.26°
- image circle 43.28mm
- length 204.97-170.32mm
- back focus 37.06mm
This is a new hig-speed standard zoom lens of Canon. What you should be surprised at is the performance. a MTF graph is described in the patent document. A fall of the contrast is not seen in this optical system at the outskirts. The left graph was Canon 24-70/2.8-3.3, but it was not released.
However, the optical system is considerably complicated. A lens behind is fixed, but the other lenses move by focusing and zooming. The Cam will become the considerably elaborate mechanism. The body tube must upsize.
