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The Pupil Lens Wheel is mounted between Fold Mirrors 1 and 2, close to the plane where the beam passes through the optical bench. By inserting a lens into the beam at this point, an image of the pupil (the telescope secondary mirror M2) is formed on the detector. The wheel has a diameter of ~XXX mm and has four positions.
| No. | Name | Comments |
| 1 | Open | Normal Observing |
| 2 | Pupil Imaging Lens | f.l. = 58 mm ZnSe Singlet |
| 3 | Spare | -- |
| 4 | Spare | -- |
Gemini Observatory Participants
The Gemini Observatory is an international collaboration with two identical 8-meter telescopes. The Frederick C. Gillett Gemini Telescope is located on Mauna Kea, Hawai'i (Gemini North) and the other telescope on Cerro Pachón in central Chile (Gemini South); together the twin telescopes provide full coverage over both hemispheres of the sky. The telescopes incorporate technologies that allow large, relatively thin mirrors, under active control, to collect and focus both visible and infrared radiation from space.
The Gemini Observatory provides the astronomical communities in six participant countries with state-of-the-art astronomical facilities that allocate observing time in proportion to each country's contribution. In addition to financial support, each country also contributes significant scientific and technical resources. The national research agencies that form the Gemini partnership include: the US National Science Foundation (NSF), the Canadian National Research Council (NRC), the Chilean Comisión Nacional de Investigación Cientifica y Tecnológica (CONICYT), the Brazilian Ministério da Ciência, the Argentinean Ministerio de Ciencia, Tecnología e Innovación Productiva, Tecnologia e Inovação and the Korea Astronomy and Space Institute (KASI). The observatory is managed by the Association of Universities for Research in Astronomy, Inc. (AURA) under a cooperative agreement with the NSF. The NSF also serves as the executive agency for the international partnership.
Last Modified: December 10, 2020, achene