now used in conjunction with digital cameras to digitize images from film-based transparencies. This method usually gives better resolution than using attachments for digital A4 flat-bed scanners. The devices are typically about 30 cm long, and screw into an intermediate 't-mount' attached to the camera. The lens in the copier does not need to be complex, because the systems are usually stopped down to small f numbers (e.g. for the Makinon Zoom Unit, at 1:1 magnification, falling to at 3:1 magnification), and the object and image distances are similar, so that many aberrations are minimized. Gallery See also Filmstrip Slide library Slide show View-Master References and notes External links Kodak TRI-X Reversal Film 7266 Ilford B&W reversal processing description dr5CHROME (B&W reversal) Color Reversal Film Information and Comparison Chart A Black & White Reversal Process In Memory Of Agfa Scala Photographic film types