Recently, my father gave me his old light meter, a Gossen Lunasix. Anyways, my problem with it is that it gives me contradictory readings when I compare it with the readings I get off my Canon Eos 100 Camera. When I take a reading from my Canon, I always use my grey card. When I use my Lightmeter, I always find that is off from the Canon reading but I know that the Canon reading is right. When I take the reading with the lightmeter, I move the white dome aside and measure it of the grey card. The obvious solution to this is that the lightmeter is not calibrated properly but I do know how to do that. And there are new batteries in the meter. I also know to read the yellow triangle. I do not have the manual to the lightmeter. I feel somewhat dejected that the lightmeter and the Camera meter do not agree. My question is whether anyone knows how to get the old manual to this lightmeter and whether they have any solutions to what my problem may be. The other question is whether people know that the Gossen Lunasix is a true spot meter or whether it is a partial meter when the white dome is removed? Whatever can be advised will be greatly appreciated.