Almost everything written about photographing Sintra gets the economics wrong. Pena, Monserrate and the Castelo dos Mouros are run by Parques de Sintra – Monte da Lua, which requires written authorisation and charges a fee for professional and commercial photography inside them; Quinta da Regaleira is a different operator with its own permission and its own fee, which catches out everyone who assumes one arrangement covers the town. Pena also runs timed entry, so the ticket dictates the schedule rather than the light does.
The part nobody sells is that the Serra itself — the roads, the ferns, the mist between the trees, the high ground above Seteais — is open and costs nothing, and it is where the photographs that actually look like Sintra are made. The second practical fact is traffic: in season the historic centre is effectively closed to private cars, and the 434 and 435 buses plus the scarcity of parking, not the sunrise, decide what time a session can start.