". This series of lenses were originally developed for special scientific and industrial use where wider-than-180° picture coverage is required in surveillance work, photographing the interiors of pipes, boilers, conduits, cylinder bores and other constricted areas.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.
I have seen one in use where two images were made at 180 degrees to each other and the resultant trannies scanned and loaded into a very early computer look-all-around programme - Long before the auto-pan-for-digicams-motorised-thing came along
Now I think it is redundant and the front elephant is used for a garden bird bath