SMALLRIG Ultra Slim 4K Adapter Cable (D to A), Micro-Sized Ports Male to Full-Sized Ports Female
Quick take
This ultra-slim HDMI adapter cable lets you connect a camera’s micro HDMI (Type D) port to a full-size HDMI (Type A) cable, with support for up to 4K@60Hz. It is a practical option for rig and cage setups where you want to reduce wear on a fragile micro HDMI port. The main tradeoff is physical flexibility and mounting options, since the cable is short and the assembly can feel more utilitarian than premium.
Pros and cons
Pros
- Converts micro HDMI (Type D) to full-size HDMI (Type A) for rig-friendly routing
- Supports up to 4K@60Hz (HDMI 2.0)
- Includes two 1/4"-20 threads and screws to mount the adapter to a cage or L bracket
- Ultra-slim PVC cable can keep your setup compact
Cons
- Short length can limit how you orient or mount it on some cages
- Cable and connectors can feel thin or basic, which may reduce confidence for heavy handling
- Not compatible unless your camera has a micro HDMI (Type D) port
What buyers think
Buyer-review evidence points to reliable day-to-day signal behavior for 4K HDMI output, with an emphasis on convenience in rig setups. Many users value the functional goal of protecting a fragile micro HDMI port by reducing repeated plugging and unplugging, and they like the included mounting option with locking screws. At the same time, review themes mention that the cable and connectors feel more lightweight and less premium than expected, and the short, ultra-slim design can restrict mounting direction on certain cage layouts. Overall, buyer feedback suggests the adapter does its job, but comfort with the build quality and cable reach matters for long-term satisfaction.
What this adapter does (and why people buy it)
The SMALLRIG 3021 is an adapter cable for HDMI routing in camera cages and rigs. One end is a micro HDMI male connector (Type D), which plugs into a camera’s micro HDMI port. The other end is a full-size HDMI female connector (Type A), so you can attach your standard HDMI cable to your monitor, recorder, or capture device.
Its core appeal is practical: instead of repeatedly stressing the camera’s micro HDMI port by direct cable connections, the adapter can stay in place on the rig side while the full-size HDMI cable is the one you swap or manage.
Key specifications to verify before you buy
1) Your camera port must be micro HDMI (Type D)
This adapter is for cameras with micro-sized HDMI ports. If your camera uses a full-size HDMI (Type A) already, you will not need this style of adapter.
2) Video support up to 4K@60Hz
It is built around HDMI 2.0 with support up to 4K at 60Hz, which matters if you are routing higher frame-rate 4K to a monitor, capture card, or recorder.
3) Mounting for cages and L brackets
The female end includes two 1/4"-20 threads plus screws, designed to attach to a cage or bracket. The cable is ultra-slim and measures about 141.1 mm (5.6 inches), so mounting flexibility depends on your rig layout.
Compatibility and fit for common camera rigs
This adapter is positioned for cameras with micro HDMI ports, including Sony A7-series models like A7R IV, A7R III, A7 III, A7 II, and A7R II, and Fujifilm X-T2 and X-T3. It can also be used on cages or L brackets that have the required 1/4"-20 thread holes (it is compatible with rig hole spacing that supports the specified mounting distance).
If you already own a cage kit, the easiest sanity check is to compare your bracket or cage’s available 1/4"-20 positions and decide where you want the adapter to sit, because the short cable length can limit alternative orientations.
Pros and cons by buyer priority
If you care most about protecting the micro HDMI port
This adapter’s design goal is to shift plug-and-unplug stress away from the camera’s micro HDMI connection. Review themes consistently highlight this as the “why,” especially for people using older or more fragile micro HDMI ports in rigs.
If you care most about mounting options
The included 1/4"-20 mounting threads are a plus, but some buyers note the cable is short enough that placement options are limited. If your cage has the port area tight to the body, you may have less freedom to mount it in a direction that avoids cable strain.
If you care most about durability feel
Functionally, buyers report stable signal output. The tradeoff is that the cable and connectors can feel thin or “less premium,” which may influence how careful you need to be when routing and handling your rig.
Verdict: is it worth it?
Choose this adapter if you are building a compact cage or rig for a camera with a micro HDMI (Type D) port and you want to route to standard HDMI without constantly stressing the camera connector. It is especially appealing when you plan to leave the adapter installed and manage connections via the full-size HDMI side. Skip it if you need a longer cable for flexible mounting or if you strongly prefer thicker, more rugged-feeling adapters, since the ultra-slim build is part of the product’s tradeoff.
Alternatives to consider (how to compare)
- If you need different HDMI direction or connector sizes: Look for an adapter that matches your exact port types, for example micro HDMI to full-size HDMI versus other HDMI gender or size combinations.
- If cable reach matters: Compare cable length and how it affects where the adapter can mount on your cage or bracket.
- If build feel matters more than compactness: Compare materials and connector sturdiness, especially if you frequently adjust cables while shooting.
FAQs
Is this adapter meant for micro HDMI (Type D) ports?
Yes. It is designed for cameras with micro-sized HDMI ports, using a micro HDMI male (Type D) connector to convert to a full-size HDMI (Type A) output.
Does it support 4K at 60Hz?
It supports up to 4K@60Hz and is based on HDMI 2.0, making it suitable for higher frame-rate 4K monitoring or capture setups.
Will it fit my camera cage or L bracket?
It includes two 1/4"-20 threaded mounting holes on the female end, intended for cage or bracket attachment with the included screws. Fit depends on your cage or bracket having compatible 1/4"-20 hole spacing and on your preferred mounting position, since the cable is short.
How long is the cable?
The cable length is approximately 141.1 mm (5.6 inches), which can limit how far you can route it or where you can mount it on some rigs.
Is it mainly for reducing wear on the camera HDMI port?
That is a key use case. By installing the adapter on the rig side, you can avoid repeatedly stressing the micro HDMI port when you connect or disconnect HDMI cables.
Specifications
| Product Title | SMALLRIG Ultra Slim 4K Adapter Cable (D to A), Micro-Sized Ports Male to Full-Sized Ports Female, 4K@60HZ, for Sony A7R IV A7RIII A7III A7II A7RII / for Fujifilm X-T2 X-T3-3021 |
|---|---|
| Category | Electronics > Camera & Photo > Accessories > Cables & Cords |
| Brand | SMALLRIG |
| Manufacturer | SMALLRIG |
| Model Number | 3021 |
| Color | Black |
| Item Weight | 31 Grams |
| Compatible Devices | Camera |
| Connector Type | Type D to A |
| Number of Ports | 1 |
| Current Rating | 1.5 Amps |
| Power Plug Type | No Plug |
| Smart Home Compatibility | Not Smart Home Compatible |
| Finish | Pvc |
| Warranty Type | Limited |
| Item Dimensions | 1.31 x 0.46 x 5.56 inches |
| Package Quantity | 1 |
| Unit Count | 1.0 Count |
| Number of Items | 1 |
| Mfr Part Number | 3021-AU |
| Item dimensions L x W x H | 1.31 x 0.46 x 5.56 inches |
Available variants
Style
- Male to Female（Angled）
- D to A
- Male to Female（Straight）
Recommended next
2 Pack 30ft Power Extension Cable Compatible with Wyze Cam
A long, flat USB to micro-USB power extension kit for Wyze (and some Blink) cameras, designed to route cleanly around rooms. It includes two 30ft cables, short adapters, and wire clips for tidier cable management, with the main tradeoff being that you will need the right camera compatibility and routing clearance.
Superbat 3G HD SDI BNC Cable 3ft (100cm) 75 ohm
A short 75-ohm RG179 SDI cable with straight BNC male-to-male ends, built for close-range HD-SDI/3G-SDI (and related) video runs where signal integrity and a secure connection matter. Best for camera-to-monitor, CCTV gear, and small production setups, with the main tradeoff being its limited length.
![3-Pack Black [3.3FT+3.3FT+6FT] USB A to USB C Cable，USB to USB C Car Carplay Cable for iPhone 16 15 Pro Plus Pro Max，for iPad Pro/Air/Mini，for Samsung S24/S23/S22/S21，for MacBook Pro/Air and More](/product-images/019ed146-86d9-7cf1-a4c7-56b5bda56912-0-b59ac2cd348e.webp)
3-Pack Black [3.3FT+3.3FT+6FT] USB A to USB C Cable，USB to USB C Car Carplay Cable for iPhone 16 15 Pro Plus Pro Max，for iPad Pro/Air/Mini，for Samsung S24/S23/S22/S21，for MacBook Pro/Air and More
This 3-pack USB A to USB-C cable set (3.3 ft, 3.3 ft, and 6 ft) is built for everyday charging plus car use, with broad compatibility across iPhone, iPad, Galaxy, Pixel, and other USB-C devices. It’s a practical pick if you want backup cables and flexible lengths, but it is specifically a USB-A to USB-C cable, so make sure your devices and power sources match.
KableCARD Multi-Functional Cable (Black, Type-C 5-pin) with Memory Reader, SIM Ejector Pin, and Ambient Light
KableCARD is a compact 6-in-1 cable kit that combines a Type-C 5-pin cable with a micro SD (T-flash) memory reader, a SIM ejector pin, and a built-in 1W ambient LED. It is best for travel and tech emergencies when you want one small set of adapters, but the cable length and the plastic hinge or latch may be limitations for everyday use.