








🎥 Elevate your Sony A7 setup with precision, speed, and style — because your gear deserves the best.
The SmallRig Baseplate 3666B is a lightweight, form-fitting bottom mount plate tailored for Sony Alpha 7 V, A7R V, and A7 IV cameras. Featuring a quick-release Arca plate, multiple mounting points, and a premium cowhide grip, it enhances handling, protects the camera base from scratches and deflection, and streamlines transitions between shooting setups. Its magnetic wrench and optimized design make it an essential upgrade for professional and enthusiast photographers seeking durability and efficiency.





| ASIN | B09P9ZVDVP |
| Audio Recording | No |
| Best Sellers Rank | #686 in Camera Mounts & Clamps |
| Brand | SMALLRIG |
| Color | Black |
| Compatible Devices | for Sony Alpha 7 V / Alpha 7R V / Alpha 7 IV |
| Customer Reviews | 4.6 out of 5 stars 179 Reviews |
| Exposure Control Type | Manual (M) |
| Folded Size | 131.5 x 64.7 x 12.5 mm |
| Iso Range | 100-32000 (expandable to 50-102400) |
| Item Dimensions D x W x H | 5.2"D x 2.56"W x 0.49"H |
| Item Weight | 80 Grams |
| Light Sensitivity | 100-32000 (expandable to 50-102400) for Sony A7R V, 100-51200 (expandable to 50-204800) for Sony A7 IV |
| Manufacturer | SMALLRIG |
| Maximum Weight Recommendation | 135 Grams |
| Media Type | ProductImage |
| Product Dimensions | 5.2"D x 2.56"W x 0.49"H |
| Video Capture Format | MP4 |
| Video Capture Resolution | 3840 x 2160 |
| Water Resistance Level | Not Water Resistant |
P**J
Beautifully made base plate for the Sony A 7RV and A 7IV.
Superb base plate with built in ARCA tripod mount for our Sony A 7RV and A 7IV cameras. I purchased two of these. Very well made with trim to match the camera that protects the bottom of the camera and provides an ARCA tripod mount as well standard threaded sockets for other accessories. Fit and finish is superb and it is very easy to fit. A handy key which is magnetically attached to the underside of the plate is used to secure the camera and mount together. Once mounted it looks like an integral part of the camera. It locates without any adjustment and fits perfectly. One thing to note is that for access to the A 7IV battery door, there is a part of the base plate that swings aside. It will need to be closed when the battery door is closed. The A7RV does not need this for full access. There are no instructions so we had to work this out for ourselves. It is a minor inconvenience that you should note but it is well executed and does not look as if it will wear out over time. Pros: 1. Extremely well made. 2. Fits exactly. 3. Looks as if it was always part of the camera with matching camera leatherette finish around the edges. 4. Provides access to the battery (note the base plate piece that swings aside for the A 7IV). 5. Provides ARCA dovetail for tripods and machined sockets for other peripherals or tripod mounts. 6. Protects the bottom of the camera. 7. Very light weight. Cons: 1. Part of the plate swings aside to gain access to the Sony A7IV battery door that may not be obvious. Summary: Thoroughly recommended as a way to protect and add functionality to your Sony A 7RV and A 7IV.
R**A
Perfect fit on the Sony a7 v
Perfect fit for the new a7V. Have used small rig plates on all of my cameras for years. Functionality and ease of use while protecting your camera and providing a tripod mount that’s compatible with most tripods.
C**Y
Must have for A7RV
This is mandatory for bigger hands. If your pinky hangs off the camera, this baseplate gives it a comfortable home. I’ve seen reviews of people saying it’s too small or issues opening the battery door and I think they got sent the A7iii grip instead. The one for the V has been upgraded for the longer grip and has a part of the baseplate that folds out so you can open your battery door all the way without having to remove the baseplate. It’s actually a very simple, yet clever design. And for $30, this thing is hard to beat.
M**R
Perfect!!!
Perfect functionality for my Sony a7RV camera! It provides the grip and comfort I was hoping for. The camera feels more substantial in my hand. Great value for the money as it is very well made and well designed to fit perfectly on my camera! I highly recommend it!!!
G**.
Excellent fit and feel on Sony A7RV
Wonderful addition to my new A7RV. Now, the grip is very similar to the size and feel of my trusty, olde Sony DSLR A850! Having the ARCA flange for quick tripod use is brilliant.
M**L
Much more comfortable on the right hand, but questionable pointy corner for the left hand.
As soon as I held my new A7iv in hand, I confirmed why some reviewers of the camera recommended this baseplate. I immediately ordered it, same day I bought the camera. I don't even have particularly large hands --average size I would say-- but my pinky still naturally wanted to rest lower than the camera allowed. Had to keep my fingers close together and it felt cramped. Just installed it and what a difference. Feels like this should've been the actual camera height from the get go. One detail I don't like is the bottom front corner is kinda pointy (the outer corner of the bottom cold shoe mount). I'm used to resting that side of the camera on the left hand while I control the lens zoom and now the point digs into the palm. Would prefer to NOT have that cold shoe (which honestly feels like an afterthought) if it could have a more ergonomic curve there.
H**A
Just buy it. You won’t regret it!
The baseplate adds a much needed grip length and comfort to my Sony A7m4! The material is sturdy and well worth the money. Pair this with the SmallRig hand strap and this setup is perfect!! What I appreciate is the many threads and adapting points to the base plate. It’s easy to install and it holds tight. I’ve had it for a year and it’s never loosened on me. As a bonus, it comes with a flat head tool that slots into the baseplate so you never lose it!
G**K
Perfect fit in 2025. Fits both models.
This works PERFECTLY on A7IV and the A7RV. I have both bodies. Disregard other reviews that say it doesn’t work. It fits perfectly and the battery door is not covered and does open once you move the little winged tab out the way. They must have redesigned it or he got the wrong one. But fit is perfect and makes a place for pinky to rest.
Trustpilot
3 weeks ago
2 months ago