How does one calculate the magnification factor for the Nikon d90 with a 70-300 mm lens?
“Magnification factor” doesn’t mean anything in terms of the view you get. We talk about: “Normal” view = aboit the same as your perception using your eyes “Telephoto” view = like looking through binoculars or a telescope “Wideangle” view = wider than your normal view, often perceived as distorted For a given sensor size, the focal length needed to give a “normal” view is about the same as the diagonal of the sensor: – for a 24x36mm sensor this is about 43mm – for the APS-C sensor that most of us use this is about 29mm The longer the focal length, the more telephoto the lens. The classic 50mm normal lens for 24×36 is actually a little bit more telephoto than the ideal.
