What I'm saying is you would percieve it at some point, different points for the naked eye or your chosen camera. But you couldn't prove it. To prove it you would need to measure and that either involves accurate recording equipment, maths on data taken from less accurate equipment or in the end just to go out so far it makes no difference. And that's all been done. Someone mentioned a go pro on a weather balloon and that's been done by school kids the world over. In a few decades when we solve global warming and we can all afford edge-of-space flights we'll all be able to see it for ourselves.
thanks once again MrMessiah for your exlanation, that's pretty accurate, that the argument about the fish eye lenses is not that relevant, because of how optics works. (at least this is how I understand the theory)
so more or so it is clear for me. if you go high enough you will be able to catch the curvature, but because of how optics works the argument of the fish eye lens is not that relevant. But, eventually, you will reach out of space and that's the clearest curve you can see, ever. But, let's talk about the vision on the more ground-level, you can still test it on a very flat surface or sea,
according to this source,
the earth's surface curves approximately 8 inches in one mile. http://mathcentral.uregina.ca/QQ/databa ... dyck2.html
but according to this, you can catch objects about 275 miles away (world record), the details in the video