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96 Technical Notes/Optional Accessories
Technical Notes
Optional Accessories
One advantage of digital SLR cameras is the wide variety of accessories they support. See
our web sites or product catalogs for up-to-date information on accessories for the D40.
Flash units (Speedlights)
Use Only Nikon Brand Electronic Accessories
Only Nikon brand accessories certified by Nikon specifically for use with your Nikon digital camera are
engineered and proven to operate within its operational and safety requirements. T
HE USE OF NON-
NIKON ACCESSORIES COULD DAMAGE YOUR CAMERA AND MAY VOID YOUR NIKON WARRANTY.
Picture Angle and Focal Length
The size of the area exposed by a 35-mm camera
is 36×24mm. The size of the area exposed by the
D40, in contrast, is 23.7×15.6, meaning that the
picture angle of a 35-mm camera is approxi-
mately 1.5 times that of the D40. The approxi-
mate focal length of lenses for the D40 in 35-mm
format can be calculated by multiplying the focal
length of the lens by about 1.5.
Picture size (D40)
Picture size (35-mm format)
Lens
(23.7 mm × 15.6 mm)
Picture diagonal
(36 mm × 24 mm)
Picture angle (35-mm format)
Picture angle (D40)
AC adapters
Batteries
Viewfinder accessories
ML-L3 remote control
Lenses
Software
Filters
Power connectors