I think some confusion may be caused by the article itself...
Quote:
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Originally Posted by https://www.photographytalk.com/beginner-photography-tips/7397-easy-astrophotography-tips-for-beginners
A fast lens with a maximum aperture of at least f/4. If your budget allows, look for something with an even larger aperture like f/2.8, f/1.8, or f/1.4.
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Lens speed and aperture are independent variables.