This ultra high resolution image is mage by smart gigapixel technology.
Canon 5dsr 2x46images at 50mm (iso 400, f/8, 0.8s und iso 400, f/8, 0.1s ) + same exposure images for ground and sky with 15mm.
Click on image below to see interactive 2.8 gigapixel panorama:
![Red Square gigapixel panorama](http://professionalpanorama.com/wp-content/uploads/2016/11/2016.11.13__18.36.41_50mm_f8.0_0.80s_acr_Panorama_combined_merged_4000-1024x395.jpg)