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Guide Camera

The KPF guide camera views the science field, but behind a long pass dichroic which sends light blueward of about 950nm to the science and Ca H&K fibers. As a result, the guide camera was chosen to be a "short wave IR" camera utilizing an InGaS detector.

Camera Model First Light CRED2
Pixel Scale 0.056 arcsec/pix
Field of View 35 x 28 arcseconds
Frame Rate up to 400 Hz (100 Hz reccommended)
Passband 950-1200 nm (0.95-1.2 microns)
Gain Settings high, medium, low

Tip Tilt Correction

Rather than using traditional telescope guiding, the guide camera takes images at high frame rates and sends corrections to a fast tip tilt mirror situated just outside the FIU. We recommend running the system at 100 Hz for optimum performance. The system will offload corrections from the tip tilt mirror to the telescope drive system periodically as needed to keep the tip tilt mirror within its optimum range of travel.

Observers should not ask the OA to start guiding when the target is acquired. The KPF software will take care of "guiding". Instead, if desired, the OA can run Magiq in "centroid only" mode which will provide FWHM and flux feedback to the observer in the normal Magiq display.