I just picked up an X-T30 II and I am leaving for a trip to Glacier National Park in like 10 days and I suddenly realized I have nothing wide enough for those massive mountain shots. I only have the XC 15-45mm kit lens and while it is okay I really want something prime and sharper that gets the whole vista you know?

I spent all night looking at reviews and I keep seeing the Samyang 12mm f2 mentioned as the best budget choice but man I am so worried about manual focus since I am still kinda new to this and dont want to ruin my vacation photos by missing focus. Then I saw the Fuji 16mm f2.8 which has autofocus and is tiny but some people on Reddit were saying 16mm isnt actually wide enough on a crop sensor for landscapes and now I am just spiraling.

My constraints are:

• Budget: Under $350 max, used is fine
• Size: Has to be light for long hikes
• Speed: I need to buy it by Friday to get it here in time
• Use case: Big landscapes and maybe some astro

Is there some other third party brand like Viltrox or TTArtisan I should look at instead? I dont want to drop $900 on the Fuji 10-24mm right now because I just spent all my money on the body. What should I do...