I'd love to give that a go with the Sigma 20/1.4, 2 more stop of light which will take it down to 12,800 and would look really clean on web size.
Except sadly the sigma 20mm is notoriously poor for astro shots. Otherwise I would have bought it. The 14mm is meant to be good. Same with the sigma 24mm f1.4. Terrible for astro work. That's why I'm looking forward to the sony 24mm F1.4
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