sooo i get the struggle!! for gimbal stuff, i'd look at these two based on ur budget: 1. Sony FE 20mm f/1.8 G - honestly my fav. it's fast, super sharp, and light. basically no breathing.
2. Sony FE 16-35mm f/4.0 PZ G - i mean, it's f/4 which kinda sucks for low light, but the power zoom means the balance wont shift on ur gimbal!! if ur doing weddings or dark spots, the 20mm is the move tbh. gl!

Saw this late but honestly, grab the Sony FE 20mm f/1.8 G. It's way lighter for ur gimbal and has basically zero breathing. Super happy with those dual XD Linear Motors!

Bump - same question here

basically i spent years messing around with different rigs and honestly the biggest mistake i see is people ignoring the physical length changes of a lens. i remember this one shoot where i was using a lens that extended just a few millimeters when focusing close... it was enough to make my gimbal freak out every time the subject walked toward me. i ended up having to tape a bunch of coins to the back of the motor just to finish the day. total amateur move but it taught me a lesson about the importance of internal focusing. one thing to be really careful about is the long term motor strain. if you pick something too heavy or with a shifting center of gravity you might not notice it during a quick test but after a six hour shoot ur gimbal motors will be burning hot to the touch. it really shortens the life of ur gear and can lead to micro-jitters in the footage that you wont see until you get to the edit suite. quick question tho before i weigh in on a specific glass... what kind of follow focus setup are you running? are you relying 100% on the fx3 internal tracking or do you have a lidar unit or manual motor attached? that makes a massive difference in which options actually work for a professional workflow.

Seconded!

Building on the earlier suggestion, i really think you might want to be careful about the weight limits on your gimbal over the long haul. I remember when i first started, i went for a heavier lens because i thought the extra features were worth it, but after a few months of daily use, i started noticing my motors getting really hot. It was honestly pretty scary because i didnt have a backup and i was always worried the whole rig would just give out mid-shoot. Since then, i have become way more conservative with what i mount. I have found that keeping things as light as possible just feels safer, especially when you are out in the field all day... What kind of weather conditions are you usually dealing with? Are you mostly in controlled environments or do you need to worry about dust and moisture getting into the gear?

I remember struggling with a bulky zoom on my gimbal and it was SO annoying to rebalance. For ur setup, I think I'd lean towards a fast prime. IIRC, the Sony wide-angle prime is super light and has internal focusing. It basically has zero breathing, which is huge for video. Honestly, a fixed lens just makes gimbal work much smoother. Just be careful with those zooms shifting ur center of gravity!