There are plenty of fancy app connected sliders on the market these days with all kinds of bells and whistles. You don’t need to spend a fortune to get your hands a slider for silky, smooth videos. SANDMARC’s Motion Dolly Slider for iPhone can help. It has an aluminum construction and lets you easily mount your phone to complete manual slides.
This smartphone dolly slider weighs 13oz. It is compatible with a wide variety of phones and GoPro cameras. As you can see in the above video, you can use this motion dolly for straight and curved slides.[where to get it]