Professionally maintained and teched prior to shipment.
F value * 2.5
Focal distance (f) * 50.5 - 97.9 mm
Throw ratio * 2.4 - 4.7:1 for PT-DZ21K/DZ8700/DZ110X (16:10 aspect ratio),
2.6 - 5.1:1 for PT-DS20K/DS8500/DS100X (4:3 aspect ratio),
2.7 - 5.2:1 for PT-DW1