I tried to use the photomerge tecnique making 18 different shots with a very short focal lens (14 mm). I merged the shots together using manual bleding modes and adobe photoshop photomerge algorithms. The final picture is 7900x7900 pixels resolution (300 dpi)

Close up

Single 18 shots before blending and compositing made with  Nikon D800 and 14-24 nikkor lens

Final blending and compositing