Nikon SLR Viewfinder Diopter AdjustmentUsers who wear eyeglasses to correct their vision can find it difficult to focus through a viewfinder with glasses on. Some Nikon SLR cameras feature a built in adjustable diopter correction system. This means it's not necessary to attach a lens to the camera to adjust the diopter setting. Simply look at the focus indicators through the viewfinder and at the same time turn the diopter adjustment knob, the correct setting is found when the focus indicators appear to be in focus and sharpest.Be careful not to knock or poke your eye when performing this adjustment. It is only necessary to adjust this once but should be checked infrequently in case your eye sight has changed.Most people will need to make a small adjustment, if you are far-sighted (need optical help to focus on nearby objects), you will need a '+' adjustment to bring the focus indicators into sharp focus. If you are near-sighted, a '-' adjustment is required. If it is not possible to bring the viewfinder focus indicators into sharp focus then you will require the additional viewfinder correction lenses see below.How much diopter adjustment is possible? Users who wear eyeglasses to correct their vision can find it difficult to focus through a viewfinder with glasses on.Cameras such as the Nikon D100 has a built-in diopter adjustment with a range of -2 to +1 adjusting this will allow some users to focus without their glasses (check the instruction manual for the range of your Nikon SLR cameras).In addition to the small amount of correction that is built into some Nikon SLR cameras, you also attach a eyepiece correction lens. The table below shows which correction lens you need for your particular prescription. Please ask your nearest dealer for advice on what lens you should use with your camera and which they have available.Nikon eyepiece correction systemPrescription+4+3+2+10-1-2-3-4Nikon correction lens+3+2+10-1-2-3-4-5Note: Cameras without eyepiece correction sytems built in such as the FM3a have a -1 diopter setting as standard. In these cameras the viewfinder eyepiece supplied has no value and is plain glass and should not be confused with a correction lens. Use the above table to calculate the correct Nikon eyepiece for your prescription.The rubber viewfinder eyepiece of some cameras may need to be removed when using diopter adjustment lenses. These accessories can be ordered through a Nikon Professional Dealer.Part # 2948 NCP correction -5Part # 2947 NCP correction -4Part # 2946 NCP correction -3Part # 2945 NCP correction -2Part # 2944 NCP correction +3Part # 2943 NCP correction +2Part # 2942 NCP correction +1Part # 2941 NCP correction +.5 Print Share By Email Share By Social Ask A Question FaceBook Twitter