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LukasSchroederfk an e-mount. canon 8-15 + metabones/sigma mc11 would look best, if you've got an a7s3 its worth the investment. It will also hold its value quite well.
eheath$1500 for a fisheye look is not the play IMO you can get the exact same look with a $200 emount lens, especially since OP said 100-300 was his budget.
LukasSchroederI mean OP spent $5k on his camera too tho, but yeah easy to crop in on 4k