I have never used flash. Most of my images are shot inside old abandoned homes and require long exposures. Long exposures = an increase in grain, which is fine in some cases, but lately I have been wanting less grainy images, so I decided to use flash. I do not know anything about flash at all (what shutter speed I should use, waht apature, exectera). I don't know how to meter, of'course it wouldn't do me any good any way being none of my camera's have a working meter and I have never used one any way. I am attaching images so you can get a general idea how the lighting is in the old homes.