Attached is a Sombrero I did for an indication of exposure times required, this was with an ED80 Canon 350d multiple 80s and several 8 minute exposures 2x drizzle applied in DSS
For this one multiple 8-10 minute exposures at least are required
Hi Rob, I had to give the image a really hard stretch to confirm it was Sombrero. You need lots longer and way more subs to lift any detail on a galaxy such as this. Everyone lately seems to be doing varying length exposures. As a general rule this is not required and the setup time would be better spent capturing. The need for shorter and varying exposure times is more of a requirement for nebulas where some form of blending is required to show up detail which is destroyed by long exposures. Targets such as Orion Nebula and Eta Carinae can benift from varying length exposures but not too many galaxies and very faint objects. The only pre requisite for these targets is lots of exposure.
