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Hi,
Apeture determines how much detail you can capture and how short your exposures will be.
A 300mm camera lens will have a very small apeture compared to either the 8" reflector or the ED100. This means longer exposures and less resolution if you can get the optical systems working at the same focal length.
You obviously get much less magnification with the 300mm focal length of the camera lens though, making it ideal for very wide field shots of whole constellations. An 8" reflector will zoom in on a much smaller part of the sky.
Have fun,
Doug
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