Short focal length board lens, also said wide angle board lens,  obviously face the the problem of large distortion, such as f=3.6mm with Dist>30% in the edge, f=4.3mm with Dist.>25%. It is suitable for most of use in video surveillance. However, some special applications will require to reduce the distortion. LenOpTec is going to engage into this project and hopefully come out in the next half year.