First light of the optics Harland Epps (UCSC) designed was achieved on July 6th! The image below is almost perfect. This is the largest and most powerful near infrared camera of its kind.
The above shows K-band spectra of a Neon calibration source. Though this is the center of the frame, the images are this beautiful across the whole detector.
Here is a picture of the slit, though it's poorly illuminated the edges are sharp throughout the whole image.
The MOSFIRE focus stage was moved a total of 8 times. The first seven times were to trace out the parabola, the last movement was to go to the position of best focus. Since then images in all bands and in spectroscopy mode are in sharp focus without focus stage adjustment.