Remove camera from tripod and engage light meter. Take meter readings from the gray card placed in the center and the four corners. To take a meter reading, move close and fill the camera viewfinder with gray card to set exposure. Return camera to tripod and do not adjust the exposure. Check for parallax error and adjust tripod head.
Tungsten film is more expensive than daylight slide film.
You can use daylight slide film with an 80A or 80B filter. Gallery installation slides should be taken with Tungsten film. Kodak Elite Ektachrome is recommended. Set up artwork against plain background. Always, Always take slides before you put works under glass.