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Old 30-07-2021, 07:07 PM
RyanJones
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RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 1,439
Hi Gordy,

Yes and no. The more subs you take, the more you can subdue the noise in the image which enables you to stretch the faint objects more without stretching the noise with it so that’s the yes. The no is that limiting magnitude is limiting magnitude. The number of subs you take doesn’t change that. Magnitude has many limiting factors not least of which is light pollution. An example would be if your sky brightness gives you a limiting magnitude of 15 for example then the size of the scope, the amount of subs or the length of those subs will never be able to reveal anything with a lower brightness than that. Further more to that fact is that in order to seperate the object from the sky brightness there has to be a given difference between the object and the sky so a sky of 15 may mean that only magnitude 13 objects will have enough contrast to be discernible for example.

Hope that clears things up a little

Cheers

Ryan
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