Will this fit/work on a really right tuff ball head? i have a sony a7r4?

I am assuming you mean Really Right Stuff ball head, and yes it does. I have a RRS head and it definitely fits.

Where can i buy the qr lever base that’s show with this qw plate?

Hi, Thank you for interesting in SmallRig. We have many kinds of QR Plate for Arca/ARRI/Manfrotto such as SmallRig 2146/1501/APU2458/APU2389... You can select them by your situation, Sincerely, SmallRig Customer Service

Will a 3/8 tripod mounting screw fit in the QR plate 1708?

A 3/8 bolt will fit through the end, but it will not slide through to the middle of the plate unless the relief is cut down to normal 1/4-20 size.

Will this 3/8 quick release plate work with a large arca swiss ballhead and a 4x5 sinar?

Not well, it will move a lot and unstable with heavier and bigger camera body

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SmallRig 2146

Product ID: 276907048

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Details

Colour
tan
Brand
SmallRig
Compatible devices
Camera
Product dimensions
68D x 38W x 8H
Item weight
0.05 Kilograms

🔗Universal Arca-Swiss compatibility

⏱️Quick release for fast mounting

⚙️Aluminum build for durability

Description

⚡️ Mount. Shoot. Move. Repeat. The pro’s quick-release secret.

STREAMLINED WORKFLOW - Enhance your rig setup for faster transitions and uninterrupted creativity.
PERFECT COMPATIBILITY - Works flawlessly with SmallRig Baseplates 2143, 2144, 2145, and 2092.
EFFORTLESS QUICK RELEASE - Save precious shooting time with instant camera mounting and detaching.
ROBUST ALUMINUM CONSTRUCTION - Lightweight yet durable design built to withstand professional use.
UNIVERSAL ARCA SWISS STANDARD - Seamlessly integrates with all Arca-compatible rigs and baseplates.

The SmallRig 2146 Quick Release Plate is a precision-engineered aluminum accessory designed for rapid mounting and detaching of DSLR and mirrorless cameras. Compatible with the Arca-Swiss standard and SmallRig baseplates 2143, 2144, 2145, and 2092, it ensures a secure, universal fit that streamlines your shooting workflow.

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