Can i use my digital camera as a light meter for my SLR analog camera?

Question

1-I mean the aperture and shutter values obtained with digital cameras
are usable with analog ones or not?
2-Does ISO (like iso 200) effect the same on analog and digital cameras?
3-In analog cameras: does B/W film nedd the same exposure time as colored film?

Answer 1

1. Aperture and shutter values are indeed the same.
2. ISO is similar, but film can be overexposed and still produce a satisfactory image, even by two or three stops, where digital images cannot be overexposed, but tolerate underexposure better than film.
3. B/W film with the same ISO rating needs the same exposure.
That being said, there are times when any light meter will give you an inaccurate reading. When the subject is backlit or there is a bright light or window in the image area, then you will need to give the picture about 2 stops more light than the meter says. The meter tries to average out the scene to a medium gray, and the brightness makes the meter leave the other areas too dark too balance it out. Very bright situations like a snowy or beach scene may also need more light than the meter says.

Answer 2

1. If all things are equal, same lens, same ISO settings, then yes. It may not be exact but should be close.
2. The ISO rating on film and the ISO effect in a digital SLR shoule be similar in terms of the ISO-Shutter Speed-Aperature relationship.
3. For a given ISO and aperature the exposure time should be the same, otherwise the B&W film should be rated at a different ISO. Of course if you want to do something creative as in purposely under or overexposing then it may take a different exposure time to reach the desired effect.