Iceland is gonna be absolutely incredible! Honestly, dont let manual focus scare you away because for huge landscapes you mostly just set it to infinity and forget it. But if you really want that total peace of mind, you seriously need to check out the Samyang AF 12mm f/2.0 X-mount. It is such a fantastic little lens and fits the X-T30 body perfectly without being bulky or heavy like the Viltrox. It usually sells for right around $330 which is a total steal for your budget. Here is why this is the winner:

• it has weather sealing which is basically a requirement for Icelandic rain
• it is way more portable than other options for long hiking days
• the f/2.0 aperture is amazing for catching the northern lights You are gonna love those wide shots! Having that extra field of view compared to your kit lens is gonna be a total game changer for the trip.

Honestly, I went through the exact same spiral before my trip to the mountains last year. I tried to go the cheap route with a manual lens thinking I could handle it, but I ended up with a bunch of slightly soft shots because I bumped the focus ring while hiking and didnt notice on the tiny screen until I got home. It was soul-crushing to see those blurry peaks, so I totally get why you want autofocus for peace of mind. If you really want to avoid that heartbreak, I would suggest looking at these two options:

• Samyang AF 12mm f/2.0 X
• This is the autofocus version of that classic lens everyone loves. Its super tiny and fits the X-T30 perfectly without making it feel lopsided. Be careful tho, the weather sealing is pretty basic, so make sure to protect it if you get caught in that famous Iceland rain.
• Viltrox AF 13mm f/1.4 XF
• This lens is a low-light beast and that f/1.4 is a lifesaver for the northern lights. But I gotta warn you, its heavy. I tried it on an X-T30 once and it felt like the camera was just an accessory to the lens. If you are doing long hikes, your neck might really feel it. One thing to watch out for with Viltrox is the quality control can be hit or miss. I would suggest buying from somewhere with a good return policy and testing it for decentering as soon as it arrives. You dont want to find out it has soft corners after you land in Reykjavik... that would be a nightmare. Also, check for firmware updates immediately because the early versions had some weird focus hunting issues.

Jumping in here to offer a different take. Like someone mentioned, the weight balance matters, but honestly, if you're worried about reliability for a trip as big as Iceland, I would steer clear of some of the third-party autofocus quirks.

• Fujifilm XF 16mm f/2.8 R WR is worth a look. It is weather-resistant, which is huge for Iceland, and tiny enough that it balances perfectly on the X-T30. It is not as fast as the f/1.4 lenses, but for landscapes, you are usually stopping down anyway.
• Samyang 12mm f/2.0 AF is genuinely the only third-party AF lens I trust for travel. It is sharp and light.
• If you really want that wider field of view without the bulk, the Fujifilm XC 15-45mm f/3.5-5.6 OIS PZ is cheap, super compact, and gets you that 15mm wide end which is significantly wider than your current kit lens. Basically, don't overthink the specs. Weather sealing and portability will save your trip more than an extra stop of light will. Have a great time!

Unfortunately, my off-brand lens had huge QC issues and felt unreliable. I finally settled on a used Fujinon XF 14mm f/2.8 R for better quality. Quick tip: keep batteries warm in your pockets!

The Viltrox 13mm f/1.4 AF is a decent option if you buy from somewhere with easy returns. Its heavy but reliable. Just test the focus accuracy before you leave so you dont worry.

Seriously, skip the manual stuff if it stresses you out. You should look at the Sigma 16mm f/1.4 DC DN Contemporary instead. Sigma glass is awesome because the autofocus is so reliable compared to some of the other third-party brands. That f/1.4 is gonna be a total lifesaver for the northern lights! Its a little big on the X-T30 but the sharpness is just night and day. If 16mm feels too tight for you, check out the TTArtisan AF 10mm f/2.0. Its way wider for those massive Icelandic landscapes and surprisingly cheap, usually well under $200. Sigma usually has better colors and contrast but the TTArtisan is so tiny and portable for hiking. Honestly, having that extra width at 10mm makes a huge difference when youre standing in front of a giant waterfall. Have an amazing trip!

Can vouch for this

Adding my two cents here. Look, for Iceland specifically, you really need to prioritize weather sealing over anything else. I have been through some brutal conditions over the years, and honestly, if your gear isnt protected, you are just asking for trouble with the moisture and wind. I used to obsess over the widest aperture possible for night shots, but in my experience, a solid tripod and a slightly slower lens are way more reliable than dealing with gear failures in the middle of a storm. Not sure if you have considered this, but have you looked into renting something higher-end for the trip? I recall doing that for a big excursion once and it saved me from spending a fortune on gear that I might only use once or twice a year. It takes the pressure off buying something you are unsure about, and you get to use top-tier glass without the long-term commitment. Whatever you pick, just make sure you feel comfortable using it before you hop on that plane.

Facts.

100% agree

I totally agree with what was said about the weight on that small body tho. It really changes everything! I remember my first big hiking trip with my X-T20 years ago. I thought I needed the biggest, beefiest glass I could find to get pro shots. Man, I was so wrong. Within two hours of climbing, my wrist was cramping because the whole setup was so front-heavy. I spent more time worrying about the camera tipping over on my strap than actually enjoying the scenery... Few things to keep in mind for the X-T30:

• the small grip makes heavy lenses feel twice as big
• balance is everything when youre tired and cold
• bulky gear usually stays in the bag instead of taking photos Iceland is gonna be windy and wild, so you really want something that feels natural in your hand. If the lens is too big, you'll feel it every single mile. Trust your gut on the portability thing!