The Schneider Kreuznach 75-150mm LS Zoom is maybe the most all-round and versatile Normal/Tele lens for the XF camera system. In combination with the Schneider Kreuznach 40-80mm LS f/4.0-5.6 Zoom, the focal length range is complete, from 40mm to 150mm with only two lenses.- Preferred lens for location fashion photography at all focal lengths.- Flash synchronization up to 1/1600th- f4/5.6 – f45- Practically no focus shift during zoom- Zoom lock function on barrel