Fotodiox Pro Lens Mount Adapter for B4 Mount Lenses to Sony Alpha NEX E-Mount Camera Bodies

SKU: FDB4NEXP MFR: B4-NEX-P
$144.95
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Key Features

  • Adapt B4 lenses to your Sony E-mount camera with this Pro lens adapter.
  • Maintain infinity focus with our precision-engineered B4 to E-mount adapter.
  • Achieve stop-down metering for accurate exposures using adapted B4 lenses.
  • Durable brass build ensures a secure, stable connection for your valuable lens.
  • Expand your lens collection using this adapter on Sony NEX & Alpha cameras.
  • Cost-effective solution: use existing B4 mount lenses on your E-mount body.
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On Backorder?Expected Availability: 10/2025
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Fotodiox Pro Lens Adapter for B4 Mount Lenses to Sony Alpha EMount Camera Bodies Specifications

  • Compatible Cameras

    Sony NEX-3, NEX-5, NEX-C3, NEX-5N, NEX-7, NEX-F3, NEX-5R, NEX-6
    Sony NEX-VG10, NEX-VG20, NEX-VG30, NEX-VG900, NEX-FS100, NEX-FS700, NEX-EA50, FS7 Camera Bodies

  • Adapter Type

    B4 (2/3") Mount Lenses to Sony Alpha NEX E-Mount (digital body)

  • Focus

    Infinity is maintained

  • Metering

    Stop-down metering

  • Material

    Brass with stainless steel finish

  • UPC Code

    847372022632

Models
Fotodiox Pro Lens Adapter for B4 Mount Lenses to Sony Alpha EMount Camera Bodies
$144.95

On Backorder

Order now, your card will not be charged until it is ready to ship.

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Special Order

Generally ships in 7-14 days, subject to availability

FeaturesBasic AdapterTilt & ShiftBasic Adapter
Camera Fitting (Male)Sony E (NEX)Sony E (NEX)Sony E (NEX)
Lens Fitting (Female)B4Pentax 645PL Mount

About Fotodiox Pro Lens Adapter for B4 Mount Lenses to Sony Alpha EMount Camera Bodies

Let the Pro Lens Mount Adapter for B4 Mount Lenses to Sony Alpha NEX E-Mount Camera Bodies enhance your photography experience. This high-quality, durable adapter is designed to allow you to seamlessly mount a B4 2/3" lens onto any Sony E-Mount NEX camera. Although devoid of corrective optics, this versatile adapter enables you to utilize your invaluable prime lens with your new camera, thereby saving you the expense of investing in new lenses.

Crafted with precision and pristine award standards, our 'Pro' Series adapters are designed to ensure a perfect fit for your camera and lens, and to withstand professional use. The compact design of the adapter ensures there is no "play" between the lens and the camera, thanks to the leaf springs that mimic the camera body. This user-friendly adapter maintains and enhances the professional appearance of your equipment.

Please note that automatic diaphragm, auto-focusing, and other functions may not operate correctly while using this adapter, as it is not electronic. In such cases, the "stop-down mode" will need to be used when metering, since the lens does not have the ability to have its aperture controlled by the camera body. However, infinity focusing is guaranteed.

This adapter is compatible with all Sony Alpha NEX E-mount Camera Bodies, including Sony NEX-3, NEX-5, NEX-C3, NEX-5N, NEX-7, NEX-F3, NEX-5R, NEX-6, Sony NEX-VG10, NEX-VG20, NEX-VG30, NEX-VG900, NEX-FS100, NEX-FS700, NEX-EA50, and FS7. For Sony FS7 and FS700 cameras, simply ensure the use of a B4 lens with a built-in doubler and that the doubler is engaged.

Constructed from anodized aluminum with a smooth surface, this adapter ensures effortless mounting and allows you to use your irreplaceable prime lens with your new camera. Please be aware that on full-frame Sony Alpha E-Mount bodies such as the Sony A7/A7r, most B4 lenses may not cover the full-frame sensor and could cause vignetting.

Fotodiox Pro Lens Adapter for B4 Mount Lenses to Sony Alpha EMount Camera Bodies Features

  • High-quality, durable Pro Lens Mount Adapter for B4 Mount Lenses to Sony Alpha NEX E-Mount Camera Bodies
  • Enables seamless mounting of B4 2/3" lens onto any Sony E-Mount NEX camera
  • 'Pro' Series adapters designed with precision and pristine award standards for professional use
  • Compact design with no "play" between the lens and camera for a secure fit
  • Versatile and user-friendly, allowing use of irreplaceable prime lens with new camera
  • Constructed from anodized aluminum for effortless mounting and enhanced durability

Warranty Information

This product has a limited warranty of 24 months.

Key Features

  • Adapt B4 lenses to your Sony E-mount camera with this Pro lens adapter.
  • Maintain infinity focus with our precision-engineered B4 to E-mount adapter.
  • Achieve stop-down metering for accurate exposures using adapted B4 lenses.
  • Durable brass build ensures a secure, stable connection for your valuable lens.
  • Expand your lens collection using this adapter on Sony NEX & Alpha cameras.
  • Cost-effective solution: use existing B4 mount lenses on your E-mount body.

What's in the box:

  • Fotodiox Pro Lens Mount Adapter B4 Mount Lenses to Sony Alpha NEX E-Mount Camera Bodies
  • Fotodiox 2 Year Limited Warranty