The Lensbaby Trio 28mm f/3.5 for Canon RF is a full-frame, wide angle prime lens for Canon RF-mount cameras and incorporates three optics in one lens: Sweet, Velvet and Twist. The Sweet optic provides sharp focus in the center with a gradual fall-off towards the edges. The Velvet optic has a dreamy, soft focus area in the center along with a soft glow. The Twist optic gives a Petzval-style swirly bokeh with a sharp center. The front element of the lens can be rotated to select the required optic. The aperture of this lens is fixed at f/3.5 and this lens must be focused manually.