Lens C2 is shorter and more compact than Lens C and has a very slightly smaller O.D. front lens ring, so a new lens cap will be provided for it. The front glass optic of Lens C2 also has a slightly larger O.D. than Lens C, with a very distinguishable clarity that will make it very easy to identify. So buy this and Save $2 OFF For Mobius New Version Wide Angle Lens C2 1080P HD Mini Action Camera Now $70.99. With Coupon Code: MobiusC2.