The Right Bent Cassegrain (RBC) port is equipped with an optical offset facility guider. The guider optical path consists of a fold mirror, a field lens, a pass band filter, and a reimaging lens.


This is a schematics of the relative position of the RBC offset guider with respect to the FOV of the slit viewing camera and the NIRES slit. The slit is shown in red. The actual guider FOV is inscribed within the fold mirror footprint.

Filter

The camera includes a Tiffen red 25 filter.


Filter curve

Camera and Detector

The camera is an Andor MARANA camera. It has a back-illuminated sCMOS detector. The size is 2048x2048 pixels with 11x11um pixel size. It is cooled with a glycol line.

array size pixel size
(micron) 		plate scale
[arcsec per pixel] 		Field of View
[arcmin]		 Notes
2048x2048 11 0.105 circular with a radius of 0.9 arcmin


Guider image example

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