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This is a story of lens selection gone wrong, and right. Often it seems, lens selection is not given much attention, and at worst, is an afterthought. Even when it is considered carefully, it is not always fully understood. Due diligence is important to avoid costly mistakes in designing video surveillance systems. The following case studies will be used to illustrate some of the most important considerations in lens selection. Both cases are from the public schools sector. Both schools had defined goals, both did research, evaluation and testing of the selected lenses before installation. Yet one project failed, while the other was a success. So what went wrong in the failed case? What made the difference in the successful application? We’ll dig into the details to find out.