u do not need high iso to capture lightning, the lightning is soooooooooooooooooooooooooo bright. :bsmilie::bsmilie:
the general settings are - lowest ISO, small aperture (typically F11 or even smaller), shutter speed depending on the ambient light, the general idea is not to overexpose the ambient. that means you can have longer shutter speed at night (can be a few seconds~30 seconds etc), and faster shutter speed at day time. you may need to mount your camera on tripod.
try to observe the lightning for a few minutes first, then you will have an general idea of where the lightning is going to strike, then aim your camera at that area, and KEEP SHOOTING and pray that the lightning strike while your shutter curtain is open, you will need luck here. :sweatsm::sweatsm: there is higher chance that you can capture he lightning at night time because of the longer shutter speed.
and which aperture to use? depends on the brightness of the lightning too, which we cant predict (luck again), i shot once with aperture of f14, but the lightning was so bright that even with f14, the whole photo still overexposed by 1 stop or more. but when i changed to f18, the lightning become not so bright and i can barely see the lightning in the photo. :sweat: