Sky-Watcher worldwide is making changes on how we market and list our ED based refractors. This speaks for all ED based refractor systems moving forward.
See the official statement below:
Sky-Watcher Policy Statement on Telescopes containing ED Glass
Sky-Watcher will not always state the types of glass and glass combinations used in their various APO telescope designs. We ask for your understanding in this regard because it is through this confidential design and manufacturing information, arrived at with skill and extensive research, which makes our products so successful. As always we would prefer the performance of any particular Sky-Watcher telescope to speak for itself.
Edited by skyward_eyes, 13 February 2018 - 04:30 PM.