yo, i feel u on the tiny screen lol. it's basically impossible in the sun. For your situation, i recommend: 1. PortKeys LH5P II 5.5-inch 2200nit High Brightness Touchscreen Monitor - super bright and light for gimbals.
2. Atomos Shinobi 5-inch 4K HDMI High Brightness Monitor - basically a lighter Ninja V if u dont need raw recording. Both handle the a7S III signal reallyyy well!! gl

Sooo, I've been shooting with the a7S III for about a year now and honestly, I totally get the struggle with that tiny flip screen. It's basically a mirror in direct sunlight! While everyone jumps straight to the recording monitors, if you don't actually NEED to record ProRes RAW, your basically just paying for extra weight and hardware you won't use. Plus, recording monitors get really hot and eat batteries like crazy, which can be a pain on long shoots. For a more budget-friendly and lighter setup that still feels professional, I've been really satisfied with the Osee T5+ 5.5 Inch 1000nits Camera Field Monitor. It’s not the absolute brightest out there, but the colors are super accurate for S-Log3 and the software tools like false color and waveforms are actually better than some of the pricier brands I've tried. If your really worried about high-noon b-roll, check out the Feelworld LUT5 5.5 Inch 3000nit Ultra Bright Camera Field Monitor. It is LITERALLY 3000 nits, which is kinda overkill but amazing for the price. It feels a bit plasticky, but it works well for handheld work because it's so light. One big warning tho—dont cheap out on the HDMI cable. Even with a full-size port, if your pushing 4K 60p, a bad cable will give you signal drops that'll drive you crazy. I use the Kondor Blue Coiled High Speed 4K HDMI to HDMI Cable and havent had a single issue. Also, be careful with the extra weight on your gimbal; I'd suggest checking your payload limits and maybe getting some Sony NPF-970 Rechargeable Battery Pack spares since high-bright screens drink power. Anyway, good luck with the new setup, it's a beast of a camera!

yo, congrats on the a7S III! seriously, that camera is a beast and the footage is just *unreal*. So, before you dive into buying anything, its important to understand why that HDMI connection is so finicky. The a7S III outputs a massive amount of data, especially at 4K 120p. If your monitor or cable isnt high-bandwidth, youll get those annoying signal drops you mentioned. basically, you need a setup that can handle 18Gbps or you're gonna have a bad time. I remember when I first started shooting with mine, I tried to save some cash by using an older display I had from my previous rig. it was a nightmare lol. The lag was so bad I kept missing focus during handheld shots. I eventually realized that for gimbal work, every gram counts. I switched to a super bright, lightweight 5.5-inch model that really focused on visibility over recording features. Honestly, the internal 10-bit recording on the a7S III is already so good that I found I didnt actually need an external recorder for most of my commercial work. My current setup is around 2200 nits, and it has been a total lifesaver for outdoor sessions. Loading my custom S-Log3 LUTs directly onto the screen made a HUGE difference too... seeing a finished look instead of that flat gray image helps me nail exposure way faster. definitely look for something that emphasizes high brightness and low weight. its gonna make your gimbal life so much easier! anyway, hope that helps you out. good luck!!

I totally agree with Marshalloak about skipping the recording monitors if you dont actually need RAW. Honestly, the reliability factor goes way up when youre not worrying about a monitor overheating mid-shot or crashing. One thing Id add tho, is no matter what screen you get, make sure you pick up a decent HDMI cable clamp or a cage for the camera. The full-size HDMI on the a7S III is definitely better than the micro versions, but if youre moving around a lot on a gimbal, that connection is still usually the first point of failure. Keeping that cable locked down is basically the best way to avoid those annoying signal drops during a high-stakes shoot.

Wow ok that changes things. Gonna have to rethink my approach now.