Of course they're not really holograms - they deal on the "pencil" ray level and not the wave optics level - even so... seeing the first 3D reconstruction of a light field (the apparent image of the lamp) must have been totally thrilling.

Film still has many advantages for plenoptic stuff. It's a large, single-use sensor.

I was refering to Lippmann holograms or interference colour photography ([1]).

His technique from 1891 preceded the first "real" photographic film and is based on a standing wave pattern in the photographic emulsion.

This hologram only works from one viewing angle but it can be reconstructed with white light.

The holograms needed to much integration time to be of practical use. And apparently they are still very colourfull.

[1] http://holography.co.uk/archives/Bjelkhagen/Belkhagen.pdf