I imaged the Tarantula Neb at 200mm (11 x 90 sec) and it gave a clearer picture. It seems to show a little at around the Hb area, although a slit would be needed to confirm this. Two attached pics show the Tarantula Nebula with spectrum (note the blue 'ghost nebula'!), and a composite showing the various features along with an unfiltered DSLR shot taken the other night (scale may vary).
Link below is to the full frame from tonight (reduced size) - very colourful, LOL! It shows lots of similar spectra to Tarantula, from little nebulae here and there.
http://i727.photobucket.com/albums/w...DSSredsize.jpg
Didn't get up into the area Merlin was referring to - hope somebody else did...
Cheers -