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Also a key factor is patience. Its easy to suffer from object-itis where you feel the need to image several different objects in a small amount of time!
Also sometimes you can invest time in mega hours on an object and the resulting image is really not worth the effort. Not all objects image well for your system, location, time of year etc etc.
But generally speaking the top images are always long exposure times.
The main difficulty is noise reduces by a much larger amount of exposure time.
To reduce noise by half and therefore double signal/noise requries something like 4X exposure time so its diminishing returns at some point.
Some objects are worth it though as Rolf's recent and Mike Sids earlier Cent A shows. Some of those shell structures and jets simply do not show up in under 15 -20 hours of imaging.
Same with Helix with its 2nd outer shell.
Greg.
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