To maximize the Sony a7 IV's capabilities, consider these essential accessories: -

Lenses: The Sony 24-70mm f/2.8 GM II offers versatility and sharpness for various shooting scenarios.

Microphones: The Rode VideoMic NTG provides broadcast-quality audio with directional pickup, enhancing video sound quality.

Re: "Honestly, while those high-end pieces are nice, you..."

• James makes a solid point about saving cash, but I actually prefer a slightly different route for keeping things light and budget-friendly. Ive been super satisfied with a more compact setup that doesnt sacrifice that high-end look. To me, maximizing the a7 IV is all about making it portable enough that you actually want to carry it everywhere. I have been using this combo for a while now and honestly have no complaints:
• Sigma 28-70mm f/2.8 DG DN Contemporary for Sony E
• This lens is a total game changer for travel. It is noticeably smaller and lighter than the Tamron or the Sony GM, and the sharpness is incredible for the price point.
• Deity V-Mic D4 Mini
• Instead of the bigger Rode mics, this one is tiny but handles wind surprisingly well. It doesnt need a battery either, which is one less thing to worry about.
• K&F Concept 67mm Variable ND Filter Nano-X
• If you are planning on shooting any video outside, you basically need this to keep your shutter speed right. This specific one is affordable but doesnt have that nasty X-pattern you see on cheap filters. Been thinking about your setup since I saw the post earlier... basically, if you go too heavy with the gear, the camera just sits on a shelf. I am really happy with how these pieces work together without breaking the bank or my back. Glad to help if you have more questions about how these balance on the body!

Honestly, while those high-end pieces are nice, you can get a LOT of value without spending thousands. If youre looking to maximize the a7 IV without breaking the bank, here is what I actually use: * **Lenses:** Check out the Tamron 28-75mm f/2.8 Di III VXD G2. Its half the price of the Sony GM stuff but the sharpness is basically 95% there for everyday shooting. * **Power:** Instead of the expensive vertical grip, I just grab a couple of the SmallRig NP-FZ100 USB-C Rechargeable Camera Battery. They have a built-in USB-C port so you dont even need a separate charger. SO much more convenient when traveling.
* **Protection/Rigging:** A basic SmallRig Full Camera Cage for Sony Alpha 7 IV is essential if youre doing video. It protects the body and lets you mount handles or a monitor later on without scratching the finish. Tbh, focus on fast cards too. You dont NEED CFexpress for everything, but a solid SanDisk 128GB Extreme PRO UHS-II SDXC Memory Card (V60 or V90) makes a huge difference in clearing the buffer when shooting bursts. Buying the right stuff the first time saves so much money in the long run.