Nikon MC-DC2 is a handy accesories if you want to explore your Nikon D3100′s potential. See my previous posts on how to create HDR and timelapse video . Besides that , it also can help you to reduce blur due to camera shake when shooting landscape , star/light trail , macro , etc

Technical details:
- Wired remote for Nikon D90 and D5000 , D3100, D7000 digital SLR cameras
- Replicates functions of the camera’s shutter button
- Offers immediate shutter release and shutter lock for long exposures
- 41-inch cable
- 15/16″W x 11/16″H x 3-5/8″D
Amazon have it in stock for $27 — Visit Amazon
If you don’t know what is an Intervalometer or what is used for , read my post on how to create timelapse video. Phottix Nikos Digital Timer Remote is an Intervalometer , a timer device that can trigger your camera periodically at specified time periods.

Features
- Self Timer : just like your camera’s self-timer but with longer period ( up to 99h 59m 59s )
- Interval Timer : trigger the camera periodically at the specified period
- Long Exposure Timer : for Bulb mode , will hold the shutter open for the specified period
- Number of Frames: define number of photos you want to take
- and best of all , you can combine above options
Compatibility
Phottix offer several cable version for any camera model. For Nikon D3100 (and D90,D5000,D7000) the cable version is N10
Order + Review
There is nice review from martybugs.net , check it out .
You can order the Nikos at Phottix website for $67. I can’t find it on Amazon,BHPhoto and Adorama.
or you can check these similar intervalometer: