The APOGEE spectrograph is coming together with the last of the optics installed early October. The camera optics and mechanics were designed and integrated by New England Optical Systems (NEOS). It features four pure silicon and a pair of fused silica lenses with the largest lens approximately 400 millimetres. It was installed along side of the VPH grating which itself is the largest mosaic grating of its kind. After installation, the optics will be warm aligned and tested. The first “cool-down” of APOGEE is less than two weeks away!
(Photos from Fred Hearty. Thanks!)