Digital Film Scanners - Olympus ES-10 Film Scanner Review, Information, and Specifications

Digital Film Scanners - Olympus ES-10 Film Scanner Review, Information, and Specifications: "ES-10, focusing is achieved by clicking the focus button on the main control screen of the driver program, positioning a 'focus bar' in the preview image, and rotating a small thumbwheel on the left-hand side of the unit's top deck. Clicking the focus button puts the software into focus mode, and allows you to place a cursor on the preview scan indicating the portion of the image you want to use to focus the scanner optics. In focus mode, the scanning software continuously scans a single column of pixels across the width of the film, calculates the total pixel-to-pixel contrast difference (an excellent measure of 'sharpness'), and displays the result on a thermometer-type display on the right-hand side of the screen. As you adjust the focus knob on the scanner, the thermometer bar display will move back and forth, indicating focus accuracy on a relative scale: The further the thermometer bar moves to the right, the sharper the focus is. If you go too far with the focus knob, the bar will begin to recede, leaving behind a small red mark showing the position of its furthest advance. In practice, a little back & forth will result in a sharply focused image with 15-20 seconds of effort."