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Hello
Yes often cameras will not get enough in focus. however the use of a barlow will allow you to achieve focus, as the barlow puts the focal plane further back (back focus). I would suggest that your problem is you don't know where abouts the focus point is. and trying to get tiny mars into view is difficult, especially with the barlow. try focusing on a distant tree or building during the daytime and mark where focus is. when centering mars at night use a high power eyepiece to center the object, then change it out for the cam and bring the focus to the point you marked earlier.
Good luck and have fun
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