DR - Dynamic Range, also known as D-Max on some digital imaging equipment, is the ability to see into the dark, shadow areas as well as the bright, like sky and clouds, area, and still have seen detail in each.
The more number of "steps" the item, camera, scanner or film has, the larger the range. The larger the range the better.
Sometimes a # is used in expressing the DR. Often is is said - D-Max 3.8 or 4.2, etc.. Again, the higher the better. If it says 3.0 or 2.9, it is not very good, often cheap or older equipment and will give poor images that are contrasty because there are not enuf steps between pure black and pure white.
Film is rated in a scale called EV - Exposure Value. Different film, different EV #'s.. A scale of 5 to 8 is said to be common but films actually go higher and some lower. Some as high as 10 or 12 stops between all black and all white. What this EV means is how many stops over and under, from a center metered position can the film still see. From a child in the sun to a child over in the shade, both in the same picture and both seen with ease. These numbers equal f/stops left and right of the picked exposure.
Photography and photographer all my life and seller of equipment.
· 9 years ago