What are the must-have accessories for a new L-mount camera?

Seconding the recommendation above. Glass is definitely the soul of the system, but honestly, transitioning from a DSLR to the S5II requires a bit of a mindset shift regarding power and storage. I've been in the L-mount ecosystem for years, and the biggest shock for most is how fast that EVF drains juice compared to an optical viewfinder.

If you're heading out for a landscape trip, you're gonna want at least three batteries. Instead of dropping $80 each on the official Panasonic DMW-BLK22 Lithium-Ion Battery, you might want to consider the SmallRig DMW-BLK22 USB-C Rechargeable Camera Battery. They're usually around $30-35 and you can charge them directly with a power bank via USB-C, which is a lifesaver in the field. Basically, it saves you from buying an external charger too.

Regarding SD cards, don't feel like you gotta buy the most expensive V90s. For the S5II, a solid V60 card is basically the "goldilocks" zone for price. I suggest the ProGrade Digital SDXC UHS-II V60 Gold 128GB or even the Kingston Canvas React Plus 128GB SDXC UHS-II V90 which is often on sale for around $50.

As for the Sigma MC-21 Mount Converter EF-L, it's a great budget way to use your old glass, but be careful—it doesn't support AF-C. For landscapes, its fine, but native glass will always feel snappier. Make sure your sorted on batteries before anything else cuz there is nothing worse than a dead camera at sunset. Good luck with the trip!

Honestly, I've been in ur shoes and it's pretty stressful when ur out in the field and gear fails. I once had a whole sunrise shoot ruined cuz I used a cheap card that couldn't handle the write speeds - it basically locked up the camera and I lost everything. Ngl, it was heartbreaking and totally my fault for not prioritizing reliability.

If you're heading out for landscapes, safety and reliability should be your TOP priority. Forget the adapter for now; using adapted glass like the Sigma MC-21 Mount Converter EF-L is okay for some, but I've unfortunately had issues with AF pulsing and weather sealing gaps that just aren't worth the risk in the wild.

You really gotta invest in high-quality media. I know the previous guys mentioned Kingston Canvas React Plus SDXC UHS-II 128GB, but I've had the most consistent luck with the ProGrade Digital SDXC UHS-II V60 Gold Series 256GB. These cards are basically tanks and handle the S5II data stream without breaking a sweat. Also, don't even look at third-party power. Mirrorless cameras are thirsty, and I've seen off-brand batteries swell or report fake charge levels. Stick to the official Panasonic DMW-BLK22 Rechargeable Lithium-Ion Battery for peace of mind. It’s expensive, but losing a shot cuz your camera won't turn on is the worst feeling ever lol. Basically, prioritize the "boring" stuff that keeps the camera running safely before the fancy glass. Gl on the trip!

ok so, i totally get the dslr-to-mirrorless struggle... i remember my first landscape trip with an L-mount body and thinking my batteries would last all day like my old tank. boy was i wrong lol. i know the previous guys mentioned batteries and fast cards already, but if you're looking for the best value, here is how i'd play it:

- Panasonic DMW-BLK22 Lithium-Ion Battery - honestly, just buy the official ones. third-party can be hit or miss with firmware updates.
- Lexar Professional 1667x Silver Series SDXC UHS-II 128GB - these v60 cards are a total steal compared to v90s and work perfectly for s5ii photos.
- SmallRig S5II L-Bracket 4137 - if you're doing landscapes, this is actually life-changing for tripod work.

basically, i learned the hard way that power is more important than adapting old glass when you're out in the field. anyway, hope that helps! peace