Well, after some quick research, I thought the DK-21 eyecup fit the D40 cameras. I should have looked a bit harder as it appears the proper eyecup is DK-16. Carry on.
Amazon.com: Nikon DK-21 Rubber Eyecup Nikon Digital SLR Cameras: Camera & Photo
Amazon states this fits the D40, mine arrived today, but no dice. Just an FYI for other Amazon shoppers out there
Amazon.com: Nikon DK-21 Rubber Eyecup Nikon Digital SLR Cameras: Camera & Photo
Amazon states this fits the D40, mine arrived today, but no dice. Just an FYI for other Amazon shoppers out there