One of the oldest formats still in widespread use, medium format cameras and film were introduced by Eastman Kodak in 1898. Medium format film is 2-3/8 inches wide, sold in paper-backed rolls commonly referred to as 120 or 220 films. Medium format images are 56mm high, with image widths depending on the camera used. Many photographers still prefer twin lens reflex (TLR) cameras for their medium format work, but medium format SLR and compact medium format cameras do exist. Medium format cameras tend to be larger, more expensive, and slower than contemporary 35mm and APS cameras, but the more detailed images produced by medium format films make them popular with some professionals, especially portrait, fashion, and wedding photographers.