Help with telescope. 10” Skywatcher Dobsonian. Using a 2x Barlow lens with either a 10mm or 25mm. I've even tried using the extender. My results are why you see in the pic,
StarSense Explorer 10" Dobsonian Telescope | Celestron
Barlow Lens: Everything You Need To Know - Little Astronomy
Best Eyepieces for Dobsonian Telescopes - Little Astronomy
StarSense Explorer 10" Dobsonian Telescope | Celestron
National Geographic N 114/500 compact Dobsonian telescope - Astronoscope
Barlow Lens: What, How To and The Best
Imaging planets with a Dobsonian telescope | BBC Sky at Night Magazine
StellaLyra 250mm, f/5 Dobsonian: The light-bucket with a touch of class – Astronomy Now