Editing Nordic Optical Telescope (section)

== Instrumentation ==
The NOT operates three instruments that can be mounted -only one at a time- under the Cassegrain focus:
* [http://www.not.iac.es/instruments/alfosc ALFOSC]: a [[CCD camera]] and [[spectrograph]]. This is a versatile instrument that gets most time in the focus. It includes a polarimetry module that allows it to be used for [[polarimetry]] and spectropolarimetry.
* [http://www.not.iac.es/instruments/notcam NOTCam]: a [[infrared camera|near infrared camera]] and spectrograph.
* [http://www.not.iac.es/instruments/mosaic MOSCA]: a 4-CCD mosaic camera, of high efficiency in the blue end of the spectra.

There are two more instruments, permanently mounted on a folded-Cassegrain configuration. Retractable folding mirrors allow to switch in short time from the main instrument to either of them.
* [http://www.not.iac.es/instruments/fies FIES]: a cross-dispersed high-resolution [[Echelle grating|echelle spectrograph]], isolated from thermal and mechanical instability. This is the latest addition to the telescope.
* [http://www.not.iac.es/instruments/stancam StanCam]: a 1 Megapixel [[CCD camera]]. Less sensitive than ALFOSC, and with a smaller field of view, it works as a companion for NOTCam (providing optical photometry), or to react to "target of opportunity" programs when neither ALFOSC nor MOSCA are mounted.

=== Visitor Instruments ===

The NOT has been host to a number of instruments on a "visitor" status.
* [http://www.not.iac.es/instruments/turpol TURPOL]: UBVRI Photopolarimeter. TURPOL has been at the NOT since the very beginning, but it is not available as part of the general instrument set.
* [http://www.not.iac.es/instruments/polcor PolCor]: a combined "Lucky" imager, polarimeter, and [[coronagraph]]
* [http://www.not.iac.es/instruments/luckycam LuckyCam]: High frame rate, low noise [[CCD camera]] for [[lucky imaging]]
* [http://www.not.iac.es/instruments/sofin SOFIN]: High resolution CCD spectrograph. This instrument was first used in 1991, spent many years usefully at the NOT, and was finally decommissioned during 2014.

=== Future ===

A new instrument for the NOT is currently under development, under the working name of NOT Transient Explorer (NTE).<ref name="nte">{{cite web|title=NTE (NOT Transient Explorer)|url=https://nte.nbi.ku.dk|accessdate=15 June 2021}}</ref> This new instrument is intended to be mounted permanently at the Cassegrain focus, providing imaging and spectroscopic capabilities both in the full optical and near-infrared range.