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How is f/4 for astro in a near zero light pollution zone? I have the opportunity to cop either the sigma art 12-24 f/4 for $850, or the tamron 15-30 f/2.8 for $650 or the laowa 12mm f/2.8 for $930. The sigma seems to be on the biggest discount and the zoom range and extra width would be really nice compared to the other two, but my body only goes to ISO6400.
I've never shot astro before, but I'm going to what's essentially a desert about 250 kms from the closest city next week and I definitely want to try it out. The light pollution map says the area is Class 1, basically the least amount of LP you'll ever get.