MIRAC has a continuous zoom mechanism that can create a range of image scales ranging from 0.054”/pixel (13.8” FOV) at the highest magnification to 0.10”/pixel (25.6” FOV) at the lowest magnification.
When the MMT is facing due south, the displayed image will have North to the left and East down. Typically, the instrument is kept fixed relative to the telescope, so that the sky will rotate on the detector during an observation. As the parallactic angle increases, North will rotate clockwise. So, for example, north will be due up on the displayed image when the parallactic angle is +90 degrees.
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MIRAC-BLINC User Manual
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