Quote:
Originally Posted by mill
The exposure time depends on the ISO and what you want to capture.
For M42 you need to experiment with the exposure time to get the trap and not blow it out.
Then you take longer exposures to get the nebulosity and blend the shorter exposures into the longer exposures( this is not always the case ).
So it all depends on what you want to image.
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I have to agree, it is all about experimenting. If you can only do short exposure then you are generally safe to do M42 without too many blowout issues. What I have learnt is processing is the key, too long exposure causes the core to blowout so you need to combine long and short exposures to get overall detail, which I have still yet to learn and experience.
Have fun, DSLR is a good beginner camera and can provide pleasing photos as you gain experience along with the addiction you can then fork out more money to get clearer pictures.
It is post like Martin's that really help advance your skill as a beginner.