Nikon D810 Product Manual - Page 450
Calculating Angle of View, Auto DX crop, FX 36×24
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A Calculating Angle of View The D810 can be used with Nikon lenses for 35 mm (135) format cameras. If Auto DX crop is on (0 75) and a 35 mm format lens is attached, the angle of view will be the same as a frame of 35 mm film (35.9 × 24.0 mm); if a DX lens is attached, the angle of view will automatically be adjusted to 23.4 × 15.6 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), DX (24×16), and 5 : 4 (30×24). If a 35 mm 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, or the aspect ratio could be changed by selecting 5 : 4 (30×24). FX (36×24) picture size (35.9 × 24.0 mm, equivalent to 35 mm format) 1.2× (30×20) picture size (30.0 × 19.9 mm) DX (24×16) picture size (23.4 × 15.6 mm, equivalent to DX format camera) Lens 5 : 4 (30×24) picture size (30.0 × 24.0 mm) Picture diagonal Angle of view (FX (36×24); 35 mm format) Angle of view (1.2× (30 × 20)) Angle of view (DX (24×16); DX format) Angle of view (5 : 4 (30×24)) 426