[davidmanze]

The Laowa is f/2.8 - and with 5 stops of vignetting, as Klaus has demonstrated. Not in the same ballpark for hardcore astro I would say (though it looks fantastic for landscape and cityscape shooting stopped down to f/5.6 or thereabouts... which is a different use case).

Well, maybe not in the same ballpark as hardcore astro, but it's still a fish-eye nonetheless, many get bored with the inevitable distortion that makes most images look more about fisheye than anything else ....

   As you say it's real strong point is keeping the verticals vertical for cityscapes and the like, to me that makes for better photos in the real world ....... and for nearly a third of the price .....