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In my experience with a Canon DSLR, forget about aperture value in camera. It's not important. Once you take the lens off and use a telescope the aperture will just read 0. The telescope will be working at what ever it's natural aperture is. Put your camera in Manual mode or Bulb mode and just concentrate on exposure times. If your telescope has a F ration of say F/10 you will need to do much longer exposures than say a F/4.
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