I have imaged a bunch of wide field DSO in narrowbands using WO GT71. I also have imaged some galaxies using RC6 in LRGB. My mount is IEQ45 Pro and I constantly get guiding RMS of 0.3-0.7 arcsec. I was thinking about the best option for small objects such as galaxies. Here is what I know:
1- long focal length refractors (such as ES 127 FCd100): slow (if reduced will have short focal length), long, and expensive, but no collimation is needed
2- RC: very hard to collimate, cheap, enough focal length even after corrector and reducer
3- Edge HD (such as 8"): cheaper than refractors, can provide a wide range of focal lengths using reducer and hyper star, hard to collimation? a dew magnet ( I am from Florida)
4- Newtonian: very cheap (normal newtonians), enough focal length, faster than all of the above items, easier collimation at F/5 (have heard it is hard at F/4)
What am i missing? If you used any of those for imaging, please let me know which one is better practically. I know they all need a kind of reducer\flattener or corrector, and yes, I don't like star spikes too, but I will get along with it.