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This is a quick comparison of the Nikon 20mm f1.8G and the Sigma 20mm ART lens for Astrophotography.
I've been using the Sigma for over a year and have produced most of my Astro images with this lens. However, I've recently decided to try out a different lens to see if lenses truly make a difference when it comes to astrophotgraphy.
Here are my findings and thoughts/opinions.