1. A method comprising: receiving, by one or more computing devices, a selection of a first lens type; determining, by the one or more computing devices, orientations of a camera for which images are to be captured to obtain image data usable for simulating the first lens type, wherein the determination is based at least in part on the first lens type; providing for display, by the one or more computing devices, a representation of the camera's current orientation along with a plurality of visual indicia indicating camera orientations at which images are to be captured to obtain image data usable for the simulating the first lens type; receiving, by the one or more computing devices, captured images from the camera at a plurality of camera orientations, wherein the captured images include an image that has been captured at an orientation corresponding to the first indicia; changing, by the one or more computing devices, a characteristic of a first indicia, from the plurality of visual indicia, based on the received image captured at the orientation corresponding to the first indicia; determining, by the one or more computing devices, a simulated image corresponding to the first lens based at least in part on the captured images; and providing for display, by the one or more computing devices, the simulated image.