PParallax Effect
This occurs when a camera utilizes one lens for the viewfinder and another in which light travels through to reach the film plane or image sensor. Twin Lens Reflex cameras and Rangefinder cameras are succeptible to Parrallax Effect or Error. An SLR or D-SLR (Single Lens Reflex/Digital Single Lens Reflex) camera corrects for this by using one lens for both the viewfinder and to capture the photographic image. Parrallax Error can also occur when photographing images to be stitched together for a panorama.