148Technical NotesUse Only Nikon-Approved Flash AccessoriesUse only Nikon Speedlights. Negative voltages or voltages over 250 V applied to theaccessory shoe could not only prevent normal operation, but could damage the synccircuitry of the camera or flash. Before using a Nikon Speedlight not in the list above,contact a Nikon-authorized service representative for more information.Using Lens Adapter RingsRemove optional lens adapter rings when not in use. The corners of the frame willbe eclipsed in any pictures taken while a lens adapter ring is mounted on the camerawithout a converter lens attached.SB-27 and SB-23 SpeedlightsSet Speedlight cntrl to Auto or Internal off when using an SB-27 or SB-23 Speedlight.At the time of writing, the following optional accessories were available forthis camera. Contact your retailer or Nikon representative for details.Optional AccessoriesAdditional EN-EL1 Li-ion batteries are available from your re-tailer or local Nikon representativeRechargeablebatteriesAC adapters/battery chargersCarrying caseCompactFlash™memory card adapterLens adapter ringsConverter lenses andlens adapters (requirelens adapter ring)Wired remote cableLens hoodFilters (attach toHN-CP10 lens hood) 77-mm (3˝) Nikon filtersHN-CP10 lens hoodMC-EU1 remote cord• FC-E9 fisheye converter (0.2 ×)• WC-E80 wide-angle converter (0.8 ×)• TC-E15ED telephoto converter (1.5 ×)• ES-E28 slide copy adapter• UR-E9 step-down ring lens adapter for WC-80 and TC-E15ED• UR-E10 step-down ring lens adapter for FC-E9• UR-E11 step-down ring lens adapter for ES-E28EC-AD1 PC-card adapterCS-CP16 soft case• EH-21 AC adapter/battery charger• EH-53 AC adapter• MH-53C battery charger (plugs into vehicle cigarette-lightersocket)Optional Speedlights SB-80DX, 50DX, 28DX, 30, 28, 27, 26, 25, 24, 23, and 22s