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How to display focal length in zoom lenses

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  • How to display focal length in zoom lenses

    I constructed a matrix of focal lengths by the number of vertical and horizontal detents necessary to calculate the number of horizontal and vertical shots in a virtual FOV. For example, I want to know the number of shots for a mosaic of 120 degrees (wide) by 90 degrees (high) for a given camera/sensor and lens. However, the calculation assumed that I could preview the focal length of a lens in the camera display. Unfortunately I doné─˘t think that's possible with a Canon 40D, which is what I'm using. Is there anyway to display the focal length in the preview?

    Thanks in advance.