1 set of 4 Shutter Blades with an option to buy a 2nd set of 4 more.

LSST Camera Shutter Overview:

The LSST Camera Shutter controls exposure duration and interrupts light while the image is read out and the telescope is being re-positioned for the next exposure. It is a double-bladed guillotine style mechanical shutter that lies tightly packaged between the L3 lens/cryostat window and the filter and its exchange system. The Shutter controls the length of time that the sensors on the focal plan are exposed to an image while blocking out all stray light when closed during read-out of the CCD sensors. The shutter is a two-blade design, where flat blades move across the focal plane to start or end an exposure. This double-acting shutter includes two shutter blade stacks. The first opens to one side to expose the field of view (FOV), beginning the exposure; then, the second blade set occludes the FOV by deploying from the opposite side, traveling in the same direction as the first. For the next exposure, the process is reversed. This provides a uniform exposure time for all pixels, since the first pixel exposed by the trailing edge of the first blade stack is also the first blocked by the leading edge of the second stack.

 
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