Optical Tune astronomy

Esprit 120ED Super APO refractors has a doublet field flattener to get a flat field and minimize aberration and distortion. Their wide 48mm opener ensures a larger and clearer aperture and also extremely minimized halation. Connect the triplet and doublet field flattener with a high precision thin thread to keep the optical axis perpendicular to the image.  Main Features:  - Premium optical materials  - Short focal length and full frame corrected focal plane  - Excellent field flatness  - Precision linear power focuser is standard  - Metallic high-transmission lens coatings  - Light-baffled optical systems  - Telescope tube attachment hardware - Full-frame Corrected Focal Plane -Zero detectable Colour Fringing even on Bright Objects Knife-edge Baffled Optical System This is a great OTA Full sized aluminum storage/carry case. As new condition. No marks or abrasions. Osmandy plate with attachment rings