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With 2.5k to spend, I would buy a 2nd hand canon 300mm f/2.8 camera lens. It's wide, it's fast. It's designed with 35mm sensors in mind and the optics have proven themselves for astro imaging.
I just recently picked up (the second one I've owned now) a tokina 300mm f/2.8 for $900 .. If you are doing narrowband imaging with a kaf8300 sensor stars will resolve to an individual pixel at times but dithering and drizzle processing will make short work of that.
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