How do “point and shoot” cameras get up to 40X optical zoom at a reasonable price while a DSLR or mirrorless “telephoto” lenses does not get close to that magnification? - Quora
Samsung Galaxy Camera 2 with 16.3MP sensor, 21x optical zoom and Android 4.3 announced
OPTICAL CALCULATOR
Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
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Magnification of a Lens Calculator
How does optical zoom work? - Quora
With the Field of View Calculator you calculate the viewing range - Avonic
Camera Field of View Calculator (FoV)
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