Distance between the rear nodal point of the lens and the focal plane is greater than 305 mm. This indicates a what focal length?

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Multiple Choice

Distance between the rear nodal point of the lens and the focal plane is greater than 305 mm. This indicates a what focal length?

Explanation:
In optics, the distance from the rear nodal point to the focal plane, called the back focal length, grows as the lens’s focal length increases. So if that distance is greater than 305 mm, the lens must have a long focal length. Long focal length lenses project smaller scenes with more magnification, resulting in a longer back focal length. Short or ultra-short focal length lenses have much shorter back focal lengths and wider fields of view, while a medium focal length would give a back focal length somewhere in between. Therefore, the distance being over 305 mm points to a long focal length.

In optics, the distance from the rear nodal point to the focal plane, called the back focal length, grows as the lens’s focal length increases. So if that distance is greater than 305 mm, the lens must have a long focal length. Long focal length lenses project smaller scenes with more magnification, resulting in a longer back focal length. Short or ultra-short focal length lenses have much shorter back focal lengths and wider fields of view, while a medium focal length would give a back focal length somewhere in between. Therefore, the distance being over 305 mm points to a long focal length.

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