Nikon D750 Product Manual - Page 460
Calculating Angle of View, Auto DX crop, FX 36×24
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A Calculating Angle of View The D750 can be used with Nikon lenses for 35mm (135) format cameras. If Auto DX crop is on (0 111) and a 35mm format lens is attached, the angle of view will be the same as a frame of 35mm film (35.9 × 24.0 mm); if a DX lens is attached, the angle of view will automatically be adjusted to 23.5 × 15.7 mm (DX format). To choose an angle of view different from that of the current lens, turn Auto DX crop off and select from FX (36×24), 1.2× (30×20), and DX (24×16). If a 35mm format lens is attached, the angle of view could be reduced by 1.5 × by selecting DX (24×16) or by 1.2 × by selecting 1.2× (30×20) to expose a smaller area. FX (36×24) picture size (35.9 × 24.0 mm, equivalent to 35mm format) 1.2× (30×20) picture size (29.9 × 19.9 mm) Lens DX (24×16) picture size (23.5 × 15.7 mm, equivalent to DX format camera) Picture diagonal Angle of view (FX (36×24); 35mm format) Angle of view (1.2× (30 × 20)) Angle of view (DX (24×16); DX format) The DX (24×16) angle of view is about 1.5 times smaller than the 35mm format angle of view, while the 1.2× (30×20) angle of view is about 1.2 times smaller. To calculate the focal length of lenses in 35mm format when DX (24×16) is selected, multiply the focal length of the lens by about 1.5 or by about 1.2 when 1.2× (30×20) is selected (for example, the effective focal length of a 50mm lens in 35mm format would be 75 mm when DX (24×16) is selected or 60 mm when 1.2× (30×20) is selected). 432
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