Mirrorless Cameras

Anyone been using a mirrorless camera for climbing trips or expeditions that they've been happy with? I'm wanting to buy one to take higher quality photos than just a smartphone. Most of the climbs I'd be looking to use it on would be alpine and multipitch so something lightweight would be nice. Also I have little to no experience with photography but am willing to put some time into learning. Thanks in advance!

A good point and shoot will probably suit you better than true mirroless SLR. I've used both the Sony RX1000 (I think it was the mk IV) and the Canon G7x Mk ii. Both of these will take pictures on par with a basic DSLR or Mirrorless setup, with way less learning curve and weight.

Shoot RAW, learn how to use shutter speed, aperature, and ISO, and then get comfortable with Lightroom ETC, and you can pull a reallllly good image out of most "advanced" level point and shoots.

I run an Fuji XT-1. It is not the lightest but you can pair it with a pancake lens and it is very small. Plus it is shock proof and dust proof and water resistant.

EDIT: As you see here and on IG almost everyone is crazy about Sony. I would recommend looking into cameras and comparing side by side. The XT-1 will get you into the game for way cheaper than Sony. Fuji Lenses are far superior for cheaper when it comes to glass. Sony is a software company making cameras, Fuji is a camera making company. One thing we all agree on is that the Rokinon 12mm cannot be beat for durability and usability and price.
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I have been using a sony a6000 for the past 3 years and it works pretty great.
Pros:
 - small enough to fit in a fanny pack or a large pocket
 - light enough that I never regret bringing it (even when I don't use it)
 - good auto focus
 - easy to adapt vintage lenses to sony e mount (this isn't helpful for climbing)
 - cheap-ish
 - rokinon 12mm lens is a beast
 - has been dropped more than once and it didn't break
 - display screen pops out (useful for shooting over a cliff edge)
cons:
 - kit lens is meh
 - will show signs of abuse if you just toss it in your pack like I do
   - got some sand in it when I took it to redrock and the click wheel spazed out for the whole trip (it got better though)
   - back screen cracked after about a year (still works though)
   - rubber viewfinder eyepiece thing fell off
 - no image stabilization (not a problem for climbing aplications)
 - crop sensor
 - no mic attachment

Definitely look into the Sony 6,xxx series. All of them are spectacular cameras. I personally use a Sony A7ii. With Sony you have the ability to pair the camera with almost every type of lens via an adapter. Join Sony Gang 

Honestly Iphone11 promax.

256 gb.   I film entire documentary's on this thing.
The images are great.

Only reason you should get a mirror-less as opposed to a phone is that you want your images to have shallow dept of field (Cinema like blurry feel). But your shooting scenic views and i am sure you want everything in focus, so you wouldn't be using the feature anyway...

So for the sake of convenience and amazing image quality, I say iPhone 11 pro max.
Since i got this thing I never take my Sony a7 anywhere..

its so nice to film 4k than shove your phone back in your pocket.

Sony A7R III and Sony A6400 here. Both great cameras. Depends if you want crop or full frame sensor. I like that I can use the same lenses on both cameras. 

I use a Fuji XT-2 and I could not be happier. It’s pretty easy to find a used one for a reasonable price and man, the lens selections are an absolute dream. Highly recommend. 

iPhone SE

Pixel 4a (coming soon 8/3 maybe?)

Unless you will be investing the time to really delve into photography, I don't think you'll see meaningfully better photos with a mirrorless setup. I've owned one of the 1" Sony compacts (RX100) and even then it doesn't take substantially better photos than a standard P&S (for outside, good light, like 99% of our photos).

The one thing you can't replace is zoom. If you want to shoot pics of wildlife at all, get a compact with a large zoom. Otherwise a decent phone will work very, very well. The AI/processing in the new iPhone and Pixel will replace having a large camera/sensor. Look at the night sky photos they can achieve. No need for a heavy, bright lens. Computer power FTW 

Used 2climbwrote: I run an Fuji XT-1. It is not the lightest but you can pair it with a pancake lens and it is very small. Plus it is shock proof and dust proof and water resistant.

EDIT: As you see here and on IG almost everyone is crazy about Sony. I would recommend looking into cameras and comparing side by side. The XT-1 will get you into the game for way cheaper than Sony. Fuji Lenses are far superior for cheaper when it comes to glass. Sony is a software company making cameras, Fuji is a camera making company. One thing we all agree on is that the Rokinon 12mm cannot be beat for durability and usability and price.
Stupid post limit

FujiXT-1 fo life - only con to it (which I've always have seen as a pro until now) All the dials are on the outside of the camera! Quick access and wonderful overall but your settings can get easily knocked and then you just waste time figuring out what's going on... I still am working on my system but that was my only unanticipated camera annoyance. Great photos out of the camera, great glass options, and fast enough camera for climbing for sure!

I shoot with a Leica Q. It’s by far the most robust camera I’ve used and has survived plenty of shit. 

I've had my own G7x Mark II for a few years, and it's still a winner. If you have a basic foundation of how to shoot using manual settings, it's amazing what you can stretch this camera to do.  

For climbing though, it would be nice to get a lens that allows you to get closer to your subject.

Olympus OM-D Em5, and a 9-18 mm lens.

Sony A7 series work great if you are looking for a full-frame.  I have an A7 with a 35mm Zeiss lens.  pretty low profile and takes amazing shots.  I prefer the full-frame camera with a wider lens because you can crop quite a bit without losing too much quality.  I believe the A7 IV is out or about to be out.  Mine is from the first series.  I would recommend an A7 II or higher, just because they refined quite a bit from the first series, but I love my camera and it works great.