Quote:
Originally Posted by Tulloch
Heh, glad it gave you a laugh 
If I could ask you to expand on this point please, because in between planetary seasons I would like to get out and try imaging some galaxies in my back yard (well, so far I've imaged the sum total of one, and not very well at that  ), why are the techniques so different between nebulae and galaxies? Planetary and DSO imaging are pretty much opposites (which I found out the hard way), why so for nebulae?
Thanks, Andrew |
Hey Andrew,
Galaxies are generally shot broadband ie: LRGB/visible light.
Nebulae can be imaged that way as well, but this requires pristine dark skies, with no Light pollution.
However unlike galaxies, nebs can also be imaged in narrowband using special filters that only allow light emitted by the ionized gases in the nebs to reach the sensor.
This means that nebs can then be imaged from light polluted & moonlit conditions ie: my backyard. However, these are ‘false colour’ images similar to those taken by Hubble etc.
Bottom line, unless you’re a very experienced imager, (and there are some here) best to image galaxies from a dark site!
Cheers
Andy