many have told me that it is not 100% compatible with the new sony alpha 7v is it true? What problems does he have?

This half cage is compatible with the new sony alpha 7v. Here is a video for your information: https://smallrig.feishu.cn/record/Pq0crk6aJedl1UcKorAcKZkPn7b

I want to use the the 3639 with a 7Riv. Is there a free 1/4" 20 under the Arca plate, where I can attach a belt clip accessory?

Yes, there are several 1/4" 20 threaded holes under the Arca plate, that you can attach a belt clip accessory that with 1/4" 20 screw.

Which locking pin do I use for the A7RV/A7V? I only have two. One says A7SIII/A1 and the other is A7IV.

Please use with the one says A7IV on it.

Sony A7 IV A7S III Half Cage | Arca QR Mount

Name: Camera Half Cage for Sony A7 V / A7R VI / A7R V/ A7 IV / A7S III / A1 / A7R IV
Brand: SmallRig
SKU: 3639
Price: 39.99 USD
Availability: InStock
Rating: 5 (11 reviews)

Camera Half Cage for Sony A7 V / A7R VI / A7R V/ A7 IV / A7S III / A1 / A7R IV

USD $

0.00

For Brands:

Sony

For Models:

α7S III、α7R IV、α7 IV、α1、α7R V、α7 V、α7R VI

SKU:

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· Lightweight Half Cage, Bare Camera Grip Feel: Retains the original camera’s ergonomic grip while adding protection and mounting points – ideal for shooters who want minimal bulk but essential expansion.
· Secure 2‑Point Locking (Bottom + Left Strap Hole): Prevents twist and deflection using a 1/4"-20 screw and side locking plate, with silicone padding to protect the camera body.
· Multiple Expansion Interfaces: 1/4"-20 & ARRI 3/8"-16 locating holes, cold shoes for attaching top handles, side grips, monitor mounts, microphones, or LED lights – versatile for run‑and‑gun or studio rigs.
· Arca‑Swiss Quick Release Plate: Directly mounts to Arca‑type tripods and DJI RS 2 / RSC 2 / RS 3 / RS 3 Pro stabilizers for seamless switching between handheld, gimbal, and tripod.
· Built‑in Magnetic Spanner & Optional HDMI Clamp: Tool‑free assembly/disassembly. Optional HDMI cable clamp (sold separately, compatible with select models) ensures stable data transmission during recording.

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User Manual

3639_Half Cage for Sony Alpha 7R V Alpha 7 IV Alpha 7S III Alpha 1 Alpha 7R IV.pdf

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