Guide head › Forums › Spectroscopy › Lhires III to telescope fibre optic cable feed › Guide head 30 July 2018 at 10:18 am #579781 Dr Andrew SmithParticipant Yes Robin is right. I use a Shelyak guide head and it is a fine bit of kit. They can customise it’s focal ratio and hole size to better suit your telescope within a certain range. Regards Andrew
