Epson PowerLite X49 3600-Lumen XGA 3LCD Projector - Manual (Page 205)

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Lens PowerLite E20:
F=1.44
Focal length: 16.7 mm
PowerLite X49/W49/118/119W:
F=1.49 to 1.72
Focal length: 16.9 mm to 20.28 mm
PowerLite 982W/992F/1288:
F=1.51 to 1.99
Focal length: 18.2 mm to 29.2 mm
Color reproduction Full color, up to 1 billion colors