Nikon D7500 Users Manual - English for customers in the Americas - Page 364
Zoom and Depth of Field, Aperture
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❚❚ Zoom and Depth of Field Before focusing, rotate the zoom ring to adjust the focal length and frame the photograph. If the camera offers depth-of-field preview (stop down), depth of field can be previewed in the viewfinder. Note: The lens uses Nikon's Internal Focusing (IF) system. Unlike other lenses, focal length decreases as the focus distance shortens. Note that the focus distance indicator is intended only as a guide and may not accurately show the distance to the subject and may, due to depth of field or other factors, not show ∞ when the camera is focused on a distant object. To lock the zoom ring, rotate it to the 18 mm position and slide the zoom lock switch to LOCK. This prevents the lens extending under its own weight while the camera is being carried from place to place. ❚❚ Aperture Aperture is adjusted using camera controls. Zoom and Maximum Aperture Changes to zoom can alter the maximum aperture by up to 11/3 EV. The camera however automatically takes this into account when setting exposure, and no modifications to camera settings are required following adjustments to zoom. 338