Altair 125mm EF F7.8 Refractor 3.7" Geared Focuser Star-test green light

The Altair Wave Series 125mm EDF F7.8 APO is a highly specified doublet APO refractor which offers plenty of aperture, portability and high resolution for the visual observer.Distinctive features of the Altair 125mm ED refractor: Better colour correction than any other ED Doublet in this size / focal range with faster cooldown than a triplet. Optical test report, with every lens carefully adjusted to meet Strehl 0.95 minimum in more demanding green light. Tested over the full aperture of 125mm.  CNC 3" Rack 'n Pinion geared focuser with 2" and 1.25" adapter. Planostar 0.8x Reducer gives tight spot size over 40mm image circle suitable for astrophotography. Optical tube weighs 8.3kg, well within the range of most mounts. Why a big doublet refractor? A 5" long focal length ED refractor hits the perfect balance for visual observers, whether you are into planetary, lunar, deep-sky or solar observing. An ED doublet lens cools faster than a triplet lens, because there is no centre-element w