A solar cell concentrator structure includes a first concentrator element having a first aperture region and a first exit region including a first back surface region and a first corner region. When the ND filter is moved between the fully-opened state and the fully-closed state, an exposure change amount corresponding to an amount offsetting the exposure change amount due to a state transition is generated by controlling iris blades. A first data structure entry may be created in a data structure, which may include the first address and status information indicating that the remote write has been received. The purpose of the development environment is to support the tasks involved in the analysis, design, construction, and maintenance of business systems, as well as the associated management processes. The caming unit has a roller assembly positioned between a pair of opposed cam plates.