Quick answer

The two versions share the same 18-300mm f/3.5-6.3 Di III-A VC VXD optical design and features; the only real difference is the mount. Choose the B061S if you shoot Sony E, and the B061X if you shoot FUJIFILM X.

Why the mount decides everything

A lens built for Sony E cannot be adapted to FUJIFILM X (or vice versa) without an adapter, and even then you may lose autofocus speed or in-body stabilization coordination. Since the B061S and B061X are otherwise identical in zoom range, aperture, minimum focus distance, VXD linear motor, and VC image stabilization, your camera body is the only deciding factor. If you own both systems, buy the version for the body you use most often for travel or walk-around shooting.

What the B061S vs B061X naming means

Tamron uses the suffix to identify the mount: B061S is the Sony E version, B061X is the FUJIFILM X version. The core specifications do not change between them. That means you can read reviews of either version for image quality and autofocus behavior, but always confirm the mount when ordering.

When the choice is not obvious

If you are shopping for a superzoom as a second lens, check which mount your primary camera uses and whether you value in-body stabilization. Both versions include Tamron's VC (Vibration Compensation), so handheld shooting at the long end is practical on either system. However, the effectiveness of stabilization can vary with the camera body's own IBIS, so try the lens on your specific body if possible. Also consider future upgrades: if you plan to switch systems, buying the mount you will stay with avoids a costly duplicate purchase.

Mount and feature FAQ

Which version fits my camera?

Match the mount: B061S for Sony E-mount bodies, B061X for FUJIFILM X-mount bodies. They are not interchangeable without an adapter.

Do both versions have VC and VXD?

Yes. Both the Sony E and FUJIFILM X versions include Tamron's VC image stabilization and VXD linear autofocus motor.

Is the optical formula the same?

Yes. The 18-300mm f/3.5-6.3 Di III-A VC VXD design is shared; only the mount and minor external differences vary.

Can I use the B061S on a FUJIFILM camera?

Not directly. You would need a third-party adapter, and autofocus and stabilization performance may be limited.

What is the minimum focus distance?

The Sony E version focuses down to 5.9 inches (15cm). The FUJIFILM X version shares the same close-focus capability.

Which should I buy if I own both systems?

Choose the mount for the body you use most for everyday or travel photography, since the lens is designed as an all-in-one carry. If you often switch between systems, consider renting or trying the lens on your main body first.

Product facts

  • Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens (Sony E, B061S): Sony E version (B061S) with a 16.6x zoom ratio and a minimum focus distance of 5.9 inches. The broad zoom range and close focusing make it a single-lens solution for Sony E shooters who want both wide scenes and close-up details.

    Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens (Sony E, B061S)

    Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens (Sony E, B061S)

  • Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens (FUJIFILM X, B061X): FUJIFILM X version (B061X) with VXD linear motor and VC image stabilization. Fast, quiet autofocus and stabilization help when shooting handheld at the 300mm end on FUJIFILM X bodies.

    Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens (FUJIFILM X, B061X)

    Tamron 18-300mm f/3.5-6.3 Di III-A VC VXD Lens (FUJIFILM X, B061X)