Hi, I am new to astroimaging. I have a celestron nextetar 130slt, canon 250D dslr and celestron tiring and adaptor. I focus on a star starting with those lowest magnification lense (25mm), then 9 mm Centre the star in both. Then switch the camera in to the eye piece mount. Some times i can focus on the star but some times it does not appear on the camera screen or view finder. I know that the star moves from the centre of the imaging field. So I have to re-centre. Is it a problem with the colimation?
david
Thank you all I will try you suggestions.