Camera Light meter
any filters you put on your camera will register directly on your
in-camera light meter.
most cameras have a light meter already built in, why do most professional
photographers use a separate light meter?
if you have a Hasselblad camera, you probably cannot afford the
built-in light meter. Same with large format, especially since most
large format systems have no built-in meters anyway.
hand held light meter will give you lots of freedom and you will
probably learn more about how to handle light if you have one. I
started out with a Gossen and eventually moved up to a Minolta.
Most professionals who have this class of meter tend to have a Minolta.
Minolta meter is an aged Flash Meter III, but it still works flawlessly
after a dozen years of dedicated service worldwide. Neither rain
nor snow nor desert heat have stopped it so far.
good photography course can help you learn how to use a light meter
or just experiment and learn on your own.