You do get lensing with some of them, I think it depends to an extent on what the background is like as well, Maia in the Pleiades has one that's quite easy to see the lensing on, but the ones in HIP 63835 aren't really visible. Neutron stars have to be shown a similar level of respect regarding how close you get as well, just in case you come across one, but at least you can see them, albeit as just a point of light![]()
Ok. Could be that NGC 6357 nebula is so dim then.. maybe BH mass also adds to their visibility/lensing? those 3 BHs were "only" few solar mass. Yeah, neutron stars are another quite scary things too, especially if you don't expect to jump to them
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