Update : For the projection of the Sigma fisheye lens EX DG 8mm F/3.5, it is an equisolid-angle one! You should have a look at this post: https://www.radiance-online.org//pipermail/hdri/2017-February/000617.html<https://www.radiance-online.org/pipermail/hdri/2017-February/000617.html>
Hope this is not too late! Best, Clotilde
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