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Canon Patent: 100-400mm f/5.5-7.1 Lens For APS-C Camera

Canon Patent: 100-400mm f/5.5-7.1 Lens For APS-C Camera

Here is an inetersting Canon patent for a 100-40mm lens. Canon Patent Application 2020-027156 (Japan) discusses optical formulas for a 100-400mm f/5.5-7.1 lens. The interesting fact is that this 100-400mm f/5.5-7.1…

Is Canon Developing A Mirror Lens With Auto-Focus?

Is Canon Developing A Mirror Lens With Auto-Focus?

That's what a Canon patent application seems to suggest, a 300mm f/2.3 mirror lens. Read on. Canon patent application 2023013456 (Japan, published 1/26/2023) discusses optical formulas for a 300mm f/2.3…

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