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Pond5 (www.pond5.com) now also has 8K backslots in its programme, including cities we like (such as Paris or Ansterdam). The backlots were stiched from three 4K streams each, producing a 160° panorama that provides room for different camera angles in production.
Incidentally: There are also “Backlots+”, which include foreground objects such as streets. Anyone who needs that can see an overview of the cities here: www.pond5.com/digital-backlots – and there are also a few free ones to try.