The following instruments are no longer available for science use. Their web pages will be available indefinitely, to support data processing and analysis of distributed and archived data, but may not be updated.
- The Acquisition Cameras are no longer offered for science use. (Archived pages in a seperate domain)
- bHROS: A high-resolution optical spectrograph. (Archived pages in a seperate domain)
- CIRPASS: A near-IR Integral Field Unit spectrograph, offered as a visiting instrument, loaned by the University of Cambridge, during 2002-2003. (Archived pages in a seperate domain)
- Flamingos-I: A near-IR imager and multi-object spectrometer, offered as a visiting instrument, loaned by the University of Florida, on Gemini South. (Archived pages in a seperate domain)
- GPI 1.0: An extreme adaptive optics system used for science from 2014A to 2020A at Gemini South.
- GRACES: A high resolution fiber fed optical spectrograph at Gemini North, a collaboration with CFHT that made use of Gemini's 8m mirror and the ESPaDOnS spectrogragh at CFHT, implemented as a visitor instrument 2015 - 2022.
- Hokupa'a-36 / QUIRC: A natural guide star adaptive optics system and its near-IR camera, offered as a visiting instrument, loaned by the University of Hawaii for early science on Gemini North. It is has since been replaced by the facility AO system Altair. (Archived pages in a seperate domain)
- Michelle: A 10-20µm imager/ spectrometer with imaging polarimetry.
- NICI: A coronagraphic imager.
- NIFS: A near-IR Integral Field Spectrometer
- NIRSPEC: A near-IR spectrograph on Keck, offered to the Gemini community for limited use during 2000-2001. (Archived pages in a seperate domain)
- OSCIR: A mid-IR imager/spectrometer, offered as a visiting instrument, loaned by the University of Florida for early science on Gemini North and, more recently, on Gemini South. It was replaced by the facility mid-IR instruments Michelle and T-ReCS. (Archived pages in a seperate domain)
- Phoenix: A visiting high-resolution spectrograph.
- T-ReCS: formerly known as MIRI: imager and spectrometer.