48nOther AccessoriesAt the time of writing, the following accessories were available for the D3000.Powersources• Rechargeable Li-ion Battery EN-EL9a (0 10): Additional EN-EL9a batteries areavailable from local retailers and Nikon service representatives. The EN-EL9a canbe recharged using an MH-23 quick charger. EN-EL9 batteries can also be used.• Quick Charger MH-23 (0 10): The MH-23 can be used to recharge EN-EL9a andEN-EL9 batteries.• Power Connector EP-5, AC Adapter EH-5a: These accessories can be used to power thecamera for extended periods (EH-5 AC adapters can also be used). The EP-5 isrequired to connect the camera to the EH-5a or EH-5.Video cable Video Cable EG-D100: Use the EG-D100 to connect the camera to a TV.Filters• Nikon filters can be divided into three types: screw-on, slip-in, and rear-interchange. Use Nikon filters; filters manufactured by other makers mayinterfere with autofocus or the electronic rangefinder.• The D3000 can not be used with linear polarizing filters. Use the C-PL circularpolarizing filter instead.• The NC and L37C filters are recommended for protecting the lens.• To prevent ghosting, use of a filter is not recommended when the subject isframed against a bright light, or when a bright light source is in the frame.• Center-weighted metering is recommended with filters with exposure factors(filter factors) over 1 × (Y44, Y48, Y52, O56, R60, X0, X1, C-PL, ND2S, ND4, ND4S,ND8, ND8S, ND400, A2, A12, B2, B8, B12). See the filter manual for details.Viewfindereyepieceaccessories• DK-20C Eyepiece Correction Lenses: Lenses are available with diopters of –5, –4, –3, –2,0, +0.5, +1, +2, and +3 m–1 when the camera diopter adjustment control is in theneutral position (–1 m –1 ). Use eyepiece correction lenses only if the desiredfocus can not be achieved with the built in diopter adjustment control (–1.7 to+0.5 m–1 ). Test eyepiece correction lenses before purchase to ensure that thedesired focus can be achieved. The rubber eyecup can not be used witheyepiece correction lenses.• Magnifier DG-2: The DG-2 magnifies the scene displayed in the center of theviewfinder. Use for close-up photography, copying, telephoto lenses, and othertasks that require added precision. Eyepiece adapter required (availableseparately).• Eyepiece Adapter DK-22: The DK-22 is used when attaching the DG-2 magnifier.• Right-Angle Viewing Attachment DR-6: The DR-6 attaches at a right angle to theviewfinder eyepiece, allowing the image in the viewfinder to be viewed at rightangles to the lens (for example, from directly above when the camera ishorizontal).