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SmallRig Baseplate for Sony a7R V & a7 IV (Version 2)

BH #SM3666B • MFR #3666B
16 reviews
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SmallRig Baseplate for Sony a7R V & a7 IV (Version 2)
Key Features
  • Integrated Arca-Type Dovetail
  • 1/4"-20 Accessory Mounts
  • Cold Shoe Accessory Mount
  • QD Quick Release Socket, Hand Strap Loop
This updated Bottom Mount Plate for Sony a7R IV & a7 IV from SmallRig features an improved design that offers a more precise fit to enhance the grip experience. The plate attaches to the bottom of the camera body with a 1/4"-20 screw and a locating pin. It features a rubberized traction pad and raised lip to prevent camera movement.
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$39.00
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SmallRig 3666B Overview

This updated Bottom Mount Plate for Sony a7R IV & a7 IV from SmallRig features an improved design that offers a more precise fit to enhance the grip experience. The plate attaches to the bottom of the camera body with a 1/4"-20 screw and a locating pin. It features a rubberized traction pad and raised lip to prevent camera movement.

The baseplate features an Arca-type dovetail design for connecting the unit to a compatible tripod, and multiple 1/4"-20 threads and a cold shoe mount are provided for attaching small accessories. A QD quick release socket has been added for additional carrying options. A magnetic flat-head screwdriver is stored in a dedicated slot so it is always handy. The side of the plate has an integrated hand strap slot and is lined with leather to provide a comfortable feel.

SmallRig 3666B Specs

Quick Release Plate
Mounting
1x 1/4"-20 Male
5x 1/4"-20 Female
Strap Loop
Yes
General
Quick Release Plate Type
Arca-Type
Quick Disconnect System
QD
Bubble Level
No
Materials
Aluminum
Dimensions
5.2 x 2.5 x 0.5" / 131.5 x 64.7 x 12.5 mm
Weight
3.2 oz / 90 g
Packaging Info
Package Weight
0.255 lb
Box Dimensions (LxWxH)
6.9 x 3.2 x 1.6"

SmallRig 3666B Reviews

Do I even need this...???

By Tim
Rated 5 out of 5
Date: 2026-02-15

When I purchased my Sony A7V, this baseplate was suggested by B&H as an add-on. I liked how it appeared to contour neatly to the bottom of the camera, but I quickly noticed it was labeled for the A7IV and A7RV, not specifically the new A7V. I contacted B&H through their online chat, and they assured me it would work. Still, I found myself wondering if I even needed it. I already own L-brackets and baseplates from other brands that serve the same purpose. After thinking it over for a few minutes, I decided that at the $40 price point, it was worth trying. If it didn’t fit properly or I simply didn’t like it, I could always return it. I’m glad I took the chance. First, it fits the A7V perfectly, no issues at all. Second, for anyone concerned about battery access, there is a notch built into the plate that allows the battery door to open fully. You absolutely do not have to remove the baseplate to change the battery. Third, it extends the grip just enough to allow my pinky finger to rest comfortably instead of curling underneath the camera body. That small ergonomic improvement makes a noticeable difference during longer shooting sessions. Lastly, it doesn’t add any additional weight compared to my older L-bracket setup, which I really appreciate. If you use an Arca-Swiss style tripod head and are considering this baseplate, it’s an excellent match for the Sony A7IV (yes, I tested it on that body as well) and the A7V, where mine now permanently lives. For the price, fit, and functionality, it turned out to be a great addition.

Not sure what the difference is between Ver 1 and 2

By Husein
Rated 5 out of 5
Date: 2024-09-12

Fan of SmallRig, have been pleased with almost everything I have purchased made by them. This is another winner. I also have this baseplate for my A7cII, which I felt needed a little something more for my hand. The A7RV has a better grip, so didn't feel this is a critical a need for this body. But now that I have it, do find that it does indeed improve the grip. One nice detail, is the plate has similar texturing to the A7RV grip, nice touch. So it doesn't feel like an add-on. I was keeping a tripod plate on my A7RV, but found it some situations shooting from a table handheld that it tilted my composition a little. And didn't 'rest' well when not in use. So this base plate improves on both those issue and does indeed improve the handhold-ability of the camera. Those are real pluses, especially since I tend to use my larger GM lenses with the this body. As the title states, not sure what the difference is between version 1 and 2 but this gets two thumbs up from me.

See any errors on this page?

Will this fit a Sony a7R IIIA ?

Will this fit a Sony a7R IIIA ?
Asked by: Eric
The SmallRig Baseplate for Sony a7R V & a7 IV will not work with a Sony A7RiiiA.
Answered by: David B
Date published: 2026-05-24

Does this fit the new a7v?

Does this fit the new a7v?
Asked by: Bruce
Yes, the SmallRig Baseplate for Sony a7R V & a7 IV (Version 2) is compatible with the Sony a7 V Mirrorless Camera (B&H # SOA75).
Answered by: Marvin C
Date published: 2026-01-08

Will this also fit the Alpha 1?

Will this also fit the Alpha 1?
Asked by: Patrick
The SmallRig Bottom Mount Plate for Sony a7R V & a7 IV (Version 2) does fit onto the Sony a1 Mirrorless Camera.
Answered by: Ejona G
Date published: 2024-03-11
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