I took this image of the North America Nebula tonight, 25 x 240s lights, with 15 darks and 30 bias frames. (I haven't tried flat frames yet as I have not had time during the day.) Taken in a Bortle 8 zone.
I have an HEQ5-Pro and use my modified Canon 60d, with a Sigma 100-500mm Lens set at 250mm. I am using an Astronomik CLS Clip In Filter from when I had an unmodified camera (This should be alright to use with my new modified camera, correct?). As you can see on some of the stars there is a line, and I am clueless as to what it is. If it was tracking, it would show up on other stars, correct? Could it be some artifact from deep sky stacker? I also noticed that some of the stars got blown out, and that is my fault for not paying enough attention in post, and I plan on re-editing this when I have time.
Any other feedback would be wonderful, as I am very new to this hobby. I am saving up for a telescope, but currently most telescopes good for imaging are out of stock.
Click here for a full resolution image: https://www.astrobin.com/full/qx2h75/0/?nc=Duckymczaps&real=&mod=