Spanish to English Other Photography/Imaging (& Graphic Arts)

From a brochure on the sights to see in Edinburgh, this on it's camera obscura which offers a virtual tour the city...

Con sus cinco pisos de ilusiones ópticas, Camera Obscura nos propone, entre todas sus atracciones, dos formas de explorar la capital.
Los telescopios de la torre de guardia nos permiten observar el pasar de los transeúntes y los monumentos de la ciudad.
Un poco más arriba, en una cámara oscura, un guía nos acerca a la historia de la ciudad y proyecta su imagen en tiempo real gracias a un ***juego de espectros***.

I know a fair bit about camera obscura, it's basic technology, a large-scale pinhole camera with a lens intead of a crude pinhole. The ones mounted in towers can be swung about and a guide expains the various places of interest. The dont involve spectrometers or anything so fancy, so I'm thinking perhaps I could render this as "set/selection/range of lenses".

Unless I'm missing something and it has a specific meaning here.

Here's another use, although in this case its used more figuratively...

https://books.google.es/books?id=yTcyBwAAQBAJ&pg=PA158&lpg=P...