Francois Gauthier , Mar 06, 2004; 11:52 a.m.
Vivitar 45 is a simple LM. If you push instead of pull, it shows the battery strenght.
The EV number is the amount of light mesured. Since you also have the corresponding table of aperture and speed, you don't need it.
This model does not mesure flash. You use it near the camera, aiming at the subject to mesure light reflected on it. You may have to correct it if the subject is too or not enough reflective (for example white or black) or use a grey card.
There is another way called incident reading. For that mode, you slide the dome (the white cover) in the center position. You then mesure light where the subject is, aiming at the camera. That way, the reading won't be affected by the reflectivity of the subject.
I don't know where to find the specific manual for this model but if you read on a similar one, it will illustrate what i just said. You could also search this site with key words 'incident', 'grey card', etc.