Quote:
Originally Posted by johnnyt123
a little question about sub time and integration time..
I have read that integrating for example 10x 3 min subs will produce the same fain detain as 1x 30min sub. but will smooth out the background noise also.
I agree with smoothing out the noise but not about bringing out more faint detail....
is my understanding right???
John
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Hi John.
I subscribe to the idea that long subs is better than doing short subs. My thinking is that doing long subs over whelms the noise floor and increases the background ADU. Which in turn means I do not have to stretch my data as much to achieve a desired brightness. Faint detail is captured easily too. Any noise that is present in an image is always going to show up when there is heavy stretching. Besides I like to hunt down the faint dust where possible. Lots of the worlds top imagers are doing long subs. Feel free to ask any of them about why they are doing this.
I prefer to gather lots of photons in a single sub rather than try to increase signal via thousands of subs for any given number of integration hours. I do collect lots of subs though but only collect until that frame is relatively noise free. I don't use an arbitrary number as suggesting by a simpleton recently. My plan is to produce noise free images.
I do have a dark sky, good mounts with excellent polar alignment and don't have to be wake to collect the data. I invariably collect way more data than I use and often throw out a lot of data that does not meet my needs, simply because I can and I am not impatient and need to be gratified instantly. That is the beauty of automation.
Try some experiments for yourself and decide what you would like to do. In any event its about what you want to achieve.
