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Forum: Pentax SLR Lens Discussion
03-09-2019, 09:29 AM
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No lens is a complete loss for star photography but lesser lenses require darker skies, longer exposures, more stacking, more post-processing, and tracking mounts to get decent images.
One major issue with astrophotography is that the physical aperture (focal length divided by f-stop) really matters in terms of bring out the stars against the backdrop of the sky. By that measure the Rokinon 14/2.8 gathers nearly 8 times as much star light as the Sigma 8/4.5.
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