The stitches are not perfect, you can still see misalignment here and there but still impressive considering the magnitude and the amount of effort put in to pp them (they look like HDR! when zoomed out of course). Take a look The BT Tower http://www.dpreview.com/news/2013/0...-London-is-the-worlds-largest-panoramic-photo "A 320-gigapixel image taken from top of London's British Telecom Tower has set the world record of the largest panoramic photo. It breaks the previous record set by a 281-gigapixel electron micrograph of a zebrafish embryo taken in 2012. The London image was shot by panorama specialists 360 Cities and is made up of 48,640 individual frames. To get an idea of just how large this photograph is, BT says if it was printed at 'normal resolution' the photo would measure measure 98 x 24 metres. The photo was taken with four Canon EOS 7D cameras and EF 400mm f/2.8L IS II USM lenses plus Extender EF 2x III teleconverters. The cameras were mounted on Rodeon VR Head ST robotic panorama heads. The team took three days to shoot the individual photos and three months to process the final image."