Appologies for the delay, been a bit busy last week…
The answer is yes and no, yet again. Yes the greater line count will give you greater dispersion and a “bigger” spectrum.
But due to the higher dispersion there is a magnitude penalty incurred. That is, you’d need a brighter meteor to exploit the gain and as there are fewer brighter meteors than faint it starts to play against you.
Also the shorter focal length lenses tend to have more field curvature and vignetting so there are some geometric issues that would need to be contended with should you capture a meteor.
However the bottom line is use what you have, I have captured spectra on a variety camera/lens/grating combinations. It’s just a matter of patience.
cheers,
Bill.