While I was recently in Nevada for NV observing, I took a photo of NGC 6357, the Lobster Nebula in Scorpius, using my 8" Newt with MPCC and 12nm H-a filter, ISO 6400, 1/3 second exposure, averaged for 15s in my iPhone XR using NightCap Camera. This image has been cropped and compressed to fit here; no other processing.
Here is a link to a NASA post of the Lobster with some great information and a beautiful long-exposure image: https://apod.nasa.go...d/ap181226.html
DISCLAIMER: Taking images is different than the visual use of NV. It is more akin to EAA because with my phone, I use up to 1 second exposures and automatic electronic photo averaging for results. With my Fujifilm XT30 camera, I take up to 20 second single exposures. If you have no interest in these results, please just skip this thread. Photo results differ from using NV visually, although it is reportedly possible to get this type of image visually, using certain fast telescopes with extreme focal reduction using very narrow band filters.