Optical interface study of MANIFEST to GMACS and GCLEF instruments

MANIFEST, the Many Instrument Fiber System, is a fiber-positioner facility proposed for Giant Magellen Telescope (GMT) by Australian Astronomical Optics, Macquarie University (AAO MQ). It will use hundreds fiber robotic positioners ”Starbugs” to access telescope large focal plane and provides a means for the first light instruments GMACS and G-CLEF to increase their native capabilities. Since the concept was proposed, a lot of development has been made. In this paper, we will report the latest optical interface development between MANIFEST to GMACS and G-CLEF instrument during the pre-conceptual design study.