SmallRig 3765 Full Cage for Sony A7IV Review: The Videographer’s Essential Rig

The SmallRig 3765 Full Cage for Sony A7IV has 20,000+ reviews on JD.com with a 4.6/5 rating at ¥399 ($55). Users praise the perfect body-contouring fit and extensive mounting options. The main complaints are added weight and partially blocked HDMI port access with certain cables. Conclusion: ✅ Worth Buying — the definitive cage for Sony A7IV owners building a professional video rig.

Introduction

The SmallRig 3765 is a precision-machined aluminum full cage designed specifically for the Sony A7IV. Like all SmallRig camera cages, it wraps around the camera body to provide protective coverage while adding NATO rails, ARRI locating holes, 1/4-20 threads, and cold shoe mounts for attaching accessories such as monitors, microphones, and handles.

SmallRig dominates the camera cage market in China with their camera-specific designs. The 3765 has become the most popular cage for the A7IV on JD.com, with 20,000+ reviews and a 4.6/5 rating. It competes with offerings from Tilta, Nitze, and Kondor Blue, but SmallRig’s value proposition — precise fit at a reasonable price — keeps it ahead.

Specifications

Spec	SmallRig 3765	Tilta TA-T30 (A7IV)	Nitze Cage (A7IV)	Kondor Blue Cage (A7IV)
Material	Aluminum 6061	Aluminum + Carbon	Aluminum	Aluminum + Wood grip
Weight	240g	275g	260g	255g
NATO Rail	Yes (left side)	Yes (top + side)	Yes (side)	Yes (top + side)
ARRI Locating	Yes (bottom)	Yes (top + bottom)	Yes (bottom)	Yes (bottom)
Cold Shoe	2	1	1	2
1/4-20 Points	8	10	6	8
Battery Access	Full access	Full access	Full access	Full access
Price (JD.com)	¥399 ($55)	¥899 ($124)	¥650 ($89)	¥750 ($103)
JD Rating	4.6/5	4.3/5	4.4/5	4.3/5

Design and Build Quality

The 3765 is crafted from CNC-machined aluminum 6061 with a bead-blasted, anodized finish. The fitment is exceptional — the cage follows the A7IV’s contours precisely without blocking any essential camera features. A single hex key (included) tightens the bottom mounting screw, and the cage grips the camera body securely with anti-twist pins.

Dual cold shoe mounts (top and side) allow simultaneous attachment of a microphone and a monitor, while the integrated NATO rail on the left side works with SmallRig’s NATO handles and grips. All important ports — HDMI, USB-C, headphone, mic — remain accessible, though some thicker HDMI cables can be a tight fit. The cage adds minimal bulk while providing comprehensive protection against drops.

“The fit is absolutely perfect — it’s like the cage was molded to the A7IV body. Every button remains accessible, and the bottom plate still has battery grip contacts accessible. SmallRig knows what they’re doing.” — JD.com user

Performance

In day-to-day use, the cage transforms the A7IV from a hybrid camera into a capable video rig. The multiple 1/4-20 and ARRI locating holes make adding a SmallRig top handle, external monitor mount, and wireless mic receiver straightforward. With the NATO rail, you can attach SmallRig’s quick-release side handle for handheld stabilization.

The cage provides excellent heat dissipation — the aluminum body acts as a heatsink, which is particularly useful for the A7IV during extended 4K/60fps recording sessions. The bottom plate features a rubber pad that prevents the cage from scratching the camera while providing grip.

“The NATO rail system is genius. I can add or remove my side handle in seconds without tools. Combined with the top handle, my A7IV feels like a proper cinema camera setup for a fraction of the cost.” — JD.com user

User Reviews by Theme

Theme 1: Performance/Quality

“Perfect fit, no wobble, all ports accessible. The aluminum finish matches the A7IV’s body surprisingly well. You’d think this was a Sony OEM accessory.” — JD.com user 💡 User satisfaction with fit and finish is nearly universal, with extremely high praise for the machining quality.

Theme 2: Durability

“Dropped my rig off a tripod (about 1m) — the cage absorbed the impact, camera was completely fine. Small dent on the cage corner. Worth every yuan for insurance alone.” — JD.com user 💡 The cage’s protective qualities are frequently validated through real-world accidents, with many users citing drop protection as a primary purchase reason.

Theme 3: Value for Money

“At ¥399, this is a no-brainer for any A7IV owner doing video work. The Tilta cage is ¥899 and doesn’t offer any significant advantages. SmallRig’s ecosystem is actually better for accessories.” — JD.com user 💡 Users overwhelmingly agree the 3765 offers the best value-to-performance ratio among A7IV cages.

Theme 4: Common Complaints

“With my thick HDMI cable (right-angle type), the cage makes the fit slightly tight. Works fine but I had to specifically buy a slim HDMI cable for the caged setup.” — JD.com user “The included hex key is tiny and easy to lose. I recommend using your own quality Allen key for the mounting screw to avoid stripping.” — JD.com user 💡 HDMI cable compatibility and the mounting screw design are the most common minor complaints.

Purchase Recommendations

✅ Worth Buying: Essential for any Sony A7IV owner who plans to use external monitors, microphones, handles, or other accessories. The best value in the cage market.

💰 Premium Pick: For professional rig builds requiring NATO on both top and side rails, the Tilta TA-T30 at ¥899 ($124) offers more rail options and a carbon fiber accent design.

⚠️ Budget Warning: If you rarely use video accessories or shoot purely handheld without rigging, skip the cage and use a simpler L-bracket for protection instead.

Pros & Cons

✅ Pros	❌ Cons
Perfect body-contouring fit for A7IV	Adds 240g to camera weight
Extensive 1/4-20 and ARRI mounting points	Some thick HDMI cables are tight fit
Dual cold shoe mounts for accessories	Included hex key is low quality
NATO rail for quick-release handles	No included top handle
Excellent heat dissipation	Bottom screw requires tool for removal
Affordable at ¥399	No color options (black only)
Full battery/port access	Lanyard mount can rattle slightly
Drop protection for expensive camera	No vertical grip cutout

FAQ

Q1: Will this cage fit the Sony A7IV with a battery grip? Yes — the bottom plate is designed with cutouts for the battery grip contacts. The cage can be used with the Sony VG-C4EM vertical grip though the fit is slightly tighter.

Q2: Does the cage block any camera buttons? No — all buttons, dials, and the shutter release remain fully accessible. The cage is specifically contoured around the A7IV’s control surfaces.

Q3: Can I use wireless charging or NFC with the cage on? NFC is still accessible through the left-hand side gap. Wireless charging may be affected if using a charging plate through the metal cage — remove the camera for wireless charging.

Q4: What is the maximum screw length I can use without hitting the camera? Use screws no longer than 5mm for the bottom 1/4-20 mount and no longer than 4mm for side mount points. Longer screws can damage the camera body. SmallRig includes appropriate-length screws.

Q5: Is the SmallRig 3765 compatible with DJI RS series gimbals? Yes — the flat bottom plate and centered 1/4-20 mount make it compatible with the DJI RS 3, RS 3 Pro, RS 4, and RS 4 Pro gimbals without requiring rebalancing.