When I used my ultra-wide field setup with a Pentax lens, I sometimes captured some nebula in Ha together with terrestrial objects. Mostly during focusing or model building.
I like these images as they make these nebula look more connected to us on earth!
|The Cygnus Loop over our house|
|The Seagull Nebula in a tree|
|"some other nebula" over our house.|
I might try to take more of such images.