LENS vs. TELESCOPE for Photographing Deep Space

What is the REAL difference between a telephoto lens and small refractor telescope? Find out in this video... The contenders are:
William Optics SpaceCat 61 WIFD - https://tinyurl.com/spacecat61 (Use code NEBULAPHOTOS for $100 off any CAT series telescope 51-71)
TTArtisan 500mm f6.3 - https://tinyurl.com/ttart500
Canon RF100-300 f2.8 L - https://bhpho.to/3Pbj8KQ

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Channel Disclosures
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I am a member of the High Point Scientific, Agena Astro, eBay, ZWO, All-Star Telescopes, B&H Photo Video, Astrobin, TTArtisan, Turing, William Optics, and Amazon affiliate programs. Product links in my video descriptions are typically affiliate links, which means, at no extra cost to you, I will make a commission if you click them and purchase something. I also have working relationships with the following companies/brands to receive products to test: Askar, ZWO, DwarfLab, OG Star Tech, Svbony, High Point Scientific, Agena Astro, QHYCCD, William Optics, SmallRig, Venus Optics, Astrogear.net, Night Sky Camera, Woodland Hills Camera & Telescope, Hunt's Photo & Video. Any gear received for review and/or brand deals will be fully disclosed in the video. If you have any questions about any of this, please get in touch.

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Video Disclosures
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The TTArtisan lens and William Optics SpaceCat 61 were sent to me for review. I am also a member of their respective affiliate programs so if you use the link in my description, I get a commission payment. Other than that there is no financial relationship, and neither company has any say into what I share about these products.