The DECam prime focus cage under the Blanco 4-m telescope before installation
About this image
The new prime focus cage, a major component of the new Dark Energy Camera, lies on its side under the Blanco 4-m telescope before it is installed. The optical alignment target can be seen just in front of the front element - a very large, fused-silica lens.
Minimum credit line: T. Abbott & CTIO/NOAO/AURA/NSF
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