Beam reduction in holography: two beam arrangement for imaging (M1, M2, M3: mirrors; L1, L2, L3: lenses; SF: spatial filters; F: film or plate). Note that the plate F is normal to collimated reference beam and emulsion side faces imaging lens. Lens L2 and plate F are rigidly mounted on a base plate.
Beam reduction in holography: reconstruction of hologram taken as in Fig. 2 (SF: spatial filter; L2, L3; lenses; F: film or plate). Note that the plate is reversed emulsion facing lens L2 and the plate is normal to reconstructing beam. Real image is projected in space in front of the lens L2.