So basically the consensus is that PortKeys wins on brightness over the Atomos Shinobi 5-inch 4K HDMI Monitor, and high-quality cables are the real key to avoiding lag. Honestly, after shooting for years, I've seen way too many people buy cheap monitors and regret it because a 500-nit screen just doesn't work in direct sunlight. You'll end up squinting and missing focus, which is a total nightmare for handheld work. For a more budget-friendly approach that still performs, check out the Feelworld F6 Plus V2 5.5 Inch Touchscreen Field Monitor. It's pretty lightweight for the FX30 and handles custom LUTs like a champ. Also, to address the port safety issue mentioned earlier, I'd highkey recommend the SmallRig Camera Cage for Sony FX30 / FX3 4183 to lock that cable in place. Tbh, the PortKeys PT6 5.2 Inch 600nit 4K HDMI Field Monitor is probably your best value pick overall. gl!

soooo i totally get the struggle of picking a monitor for the fx30!! jumping in here because i spent forever researching this stuff since i was srsly terrified of damaging my cameras ports... honestly you gotta be SO careful with those hdmi connections lol. here is how they compare imo:
- Atomos Shinobi 5-inch 4K HDMI Monitor: this one is super reliable and the menus are so easy to use!! it feels really safe and the colors are amazing, but ngl it kinda struggles in direct sunlight compared to the newer portkeys models.
- PortKeys LH5P II 5.5-inch Touchscreen Monitor: seriously this thing is AMAZING. it has 2200 nits so daylight visibility is fantastic!! plus you can actually control the fx30 settings via the screen which is literally a lifesaver for handheld work. i ended up loving the portkeys for the brightness but i always use a SmallRig HDMI Cable Clamp for Sony FX30 to keep the signal stable. definitely dont skip a clamp cuz the connection can be finicky!! anyway gl with the rig!!

For your situation, I've used both brands on my FX30 and here's what I learned: - My current setup from PortKeys is *way* brighter for outdoor work than the Atomos I had.
- HDMI lag was basically non-existent, but you gotta use high-quality cables.
- Custom LUTs work fine, tho the menu on one is kinda clunky... Id suggest checking total costs with batteries cuz they add up fast!!

Quick reply while I'm looking at my own spreadsheet for this lol. I'm pretty new to rigging up my FX30, but I’ve been doing a ton of market research into the technical specs because I’m a bit of a data nerd. Honestly, I’ve been comparing the nit-to-weight ratios of a bunch of brands. Have you looked at the Godox GM55 5.5" 4K HDMI Touchscreen On-Camera Monitor? It’s only about 5.5 inches and the specs say it’s super light, which I thought would be perfect for handheld work, though I'm still learning about how much the battery drain actually affects the total weight you're carrying around. I also saw the Desview R6 UHB 5.5 Inch 2800nits Ultra High Brightness Touchscreen Field Monitor while browsing. On paper, it hits 2800 nits which basically blows the Shinobi out of the water for daylight stuff. It seems like the market is moving toward these super high-bright panels for cheap, but I'm worried if the colors stay accurate when it's pushed that hard? I'm still trying to figure out if these budget brands actually hold up for professional color work or if it's mostly just marketing hype... wait, do those high-nit screens get really hot? I don't want a noisy fan right next to my FX30's internal mics, you know?