DK-5
When using the self timer or remote release it is recommended to remove the viewfinder eyepiece cup and attach the DK-5 eyepiece cap. This will prevent light entering the viewfinder from affecting the exposure in auto exposure modes.
D3100
Stunningly simple-to-use DX-format SLR with 14.2 megapixel CMOS image sensor, Guide Mode, EXPEED 2, razor-sharp 11-point Autofocus system and full HD D-Movie. Boasts a lightweight body and superior ergonomics.