96 Technical Notes/Optional AccessoriesTechnical NotesOptional AccessoriesOne advantage of digital SLR cameras is the wide variety of accessories they support. Seeour web sites or product catalogs for up-to-date information on accessories for the D40.Flash units (Speedlights)Use Only Nikon Brand Electronic AccessoriesOnly Nikon brand accessories certified by Nikon specifically for use with your Nikon digital camera areengineered and proven to operate within its operational and safety requirements. THE USE OF NON-N IKON ACCESSORIES COULD DAMAGE YOUR CAMERA AND MAY VOID YOUR N IKON WARRANTY.Picture Angle and Focal LengthThe size of the area exposed by a 35-mm camerais 36×24mm. The size of the area exposed by theD40, in contrast, is 23.7×15.6, meaning that thepicture 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-mmformat can be calculated by multiplying the focallength 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 adaptersBatteriesViewfinder accessoriesML-L3 remote controlLensesSoftwareFilters AC adapter connectors
