The Ollin Adapter Kit is a digiscoping adapter that allows you to capture photos and video by attaching your smart phone to your Maven optic . The Maven optic adaptor ring slides over the ocular eyepeice and accepts all Ollin cases or tabs. Choose the correct ring for your optic, then choose all phones, you'll receive a $40 gift code* towards the purchase of your Ollin case specific to your cell phone via the Ollin website . If you are already an Ollin user choose the correct ring for your optic and no phone to use your existing case. Learn more about Ollin at ollin.co . *Ollin automatically adds $2.49 for free unlimited returns, if you don't wish to have this applied choose the "Continue without return shipping" link on the cart page.