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By "telescope sight" I assume you mean something that looks like crosshairs with a round obstruction in the centre? That is your secondary mirror the four spider vanes simply way out of focus. Your DSLR is not in focus then. You need to wind the focuser from one end of travel to the other and see if there is a difference.
Think of it this way.... The distance from the surface of the primary mirror, up the tube, bouncing off the secondary diagonal mirror, up the focuser and onto the surface of the CCD camera chip - that distance is what needs to be correct for the image in the camera to be "in focus" Or what we call the Focal Length. This distance will be different for an eyepiece.
So when you wind the focuser all the way out, you are lengthening this distance. Winding it in, you are shortening the distance. It would appear you do not have enough travel in the focuser to find the correct distance for the camera.
If you wind the focuser one way or the other does the "telescope sight" vary in size? Does it get better in one direction? If you wind it out and it gets better ( better means the telescope sight gets smaller and the big blurry light behind it (which is Jupiter out way out of focus) gets smaller, then you need to push the primary mirror back down the tube.
Last edited by stephenb; 10-02-2013 at 09:05 AM.
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