A design for a scalable large format exposure shutter for CCD mosaic cameras has been developed at the Astronomical Institutes of the University of Bonn (now the "Argelander Institute for Astronomy", AIfA) as part of the BUSCA project. BUSCA  the Bonn University Simultaneous CAmera is  based on 4 independent CCD systems (4Kx4K pixels each) for simultaneous imaging in four color bands (at the 2.2m telescope at Calar Alto). This first Bonn Shutter has an aperture of 110mm x 110mm.

The Bonn Shutter is a slit type shutter with a rectangular aperture. It is a low acceleration impact-free device. It consists of three main components --- mechanics, control electronics hardware and control electronics software --- which play together to achieve the shutter performance: Photometric accuracy of  the order of  1% at an exposure time of 0.1sec (i.e. timing accuracy of 1msec) at any position across the aperture. The table below gives specifications and measured performance parameters for one of the largest Bonn Shutters built so far, the OmegaCAM shutter at the ESO VLT Survey Telescope (VST).

These parameters are typical even for the larger shutters like the 480mm x 480mm Pan-STARRS shutter or the 600mm aperture Decam shutter.