The Osprey Video Capture Driver allows you to configure which pairing of fields will be used to construct a frame. For interlaced capture devices (most current video cameras) the field order does not matter and the 'Allow Either' setting will provide better performance in VFW preview mode. The default setting for this feature is 'Allow Either'. Use the force odd-even or force even-odd settings with a progressive scan camera. Consult your camera's technical documentation for the correct setting to use. Using the correct setting with a progressive scan camera will eliminate comb-like interlacing artifacts.