Ricoh Hadar-PJ1cx PJ W1000 Technisch trainingshandboek - Pagina 4

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See the specifications table in the service manual for more details.
Contrast: Compare with Sirius-PJ1 which has a contrast of 2000:1
What does '9000:1' mean?
It means that the white areas are 9000 times brighter than the black areas.