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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).
Lens
FX (36×24) picture size (35.9 × 24.0 mm,
equivalent to 35 mm format)
Picture diagonal
DX (24×16) picture size (23.4 × 15.6 mm,
equivalent to DX format camera)
5 : 4 (30×24) picture size
(30.0 × 24.0 mm)
Angle of view (FX (36×24); 35 mm format)
Angle of view (DX (24×16); DX format)
Angle of view (5 : 4 (30×24))
1.2× (30×20) picture size
(30.0 × 19.9 mm)
Angle of view (1.2× (30×20))