> the claims suggest the aragascope can actually be smaller. This may be because of the shape of the PSF is different from the normal airy disk one. Here is a

> the claims suggest the aragascope can actually be smaller. This may be because of the shape of the PSF is different from the normal airy disk one. Here is a random google result showing the spot of arago, https://www.lighttrans.com/use-cases/application/observation-of-the-poisson-spot.html#images https://www.lighttrans.com/use-cases/application/observation... -- which looks to me like it would have poor contrast but good resolution. Though I'm out of my depth so it could be nonsense. :P Edit: Ah, yeah the graph at figure 9 in the report linked on the linked page shows something like that.