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Hi,
With a webcam or a DSLR with live view you can view the moon and the brighter planets in real time. However for nebula's and galaxies you need to hold the shutter open for many seconds or even minutes to get a decent picture to form.
It also dpends on the size of the telescope's aperture as to how quick the image will resolve.
To get a really nice image of a nebula or galaxy you will need to stack many images on top of each other to reduce the background noise.
There is free astro software availble to do this.
Regards
Bill
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