Sony FE 40mm f/2.5 E-Mount Prime G Lens

Sony Vendor Logo SKU: EM17335MFG: SEL40F25G

• Compact E-mount lens ideal for Sony ILX-LR1
• 40 mm focal length
• F2.5 maximum aperture
• Aspherical lens elements
• Linear motors for quick auto-focusing

Choose a Camera

Sony ILX-LR1 Industrial Camera
Sony ILX-LR1 Industrial Camera
Sony a7R IV Mirrorless Digital Camera Body ILCE7RM4
Sony a7R IV Mirrorless Digital Camera Body ILCE7RM4



The Sony® FE 40mm f/2.5 Prime G Lens is a full-frame E-mount lens ideal for shooting video and still with the Sony ILX-LR1 Industrial Camera. This superb, lightweight lens has an F2.5 aperture, three double-sided aspherical elements to minimize aberration, and double linear motors for precise, motorized auto-focusing.

Unsurpassed Visual Clarity

The Sony FE 40mm lens' F2.5 maximum aperture offers stunning contrast and resolution for full-frame E-mount bodies like the Sony ILX-LR1 Industrial Camera, used for UAV drone surveillance and inspection.

A bright maximum aperture = outstanding sharpness and clarity when shooting handheld or from a UAV drone in low-light or standard conditions.

Aspherical Lens Elements 

The aspherical lens design effectively minimizes spherical aberration, resulting in a smaller and lighter lens. The misalignment of light rays on conventional spherical lenses, known as "spherical aberration," can degrade image quality in larger-aperture lenses. To correct this, aspherical elements are strategically placed near the diaphragm to realign the light rays and maintain sharpness and contrast even at maximum aperture. They can also be used at other points in the optical path to reduce distortion.

Additionally, well-designed aspherical elements can decrease the total number of elements needed in the lens, ultimately decreasing its size and weight. The Advanced Aspherical (AA) elements, with their high thickness ratio between the center and periphery, are a superior version that requires advanced molding technology to achieve precise shape and surface accuracy, resulting in highly accurate and quality images.

Manual and Auto Focus Options

Double linear motors allow the lens to auto-focus (AF) quickly and precisely. Along with superb tracking performance, the Prime G lens is ideal for shooting video and stills. AF is ideal for UAV applications where movement is constant, even during hovering.

There are also programmable focus-hold presets for multiple custom functions.

7-Blade Circular Aperture

The seven-blade circular aperture works with the lens optics to produce a smooth 'bokeh' effect (an out-of-focus background and natural, sharp foreground target). This aperture style avoids the unattractive polygonal shapes created by conventional flat-sided blades in other lenses.

Dust and Moisture Resistant

This lens is designed to withstand dust and moisture, making it ideal for rugged outdoor use. It pairs perfectly with weather-resistant cameras for even better protection.

Supplied Accessories

Lens hood: ALC-SH165, Lens front cap: ALC-F49S, Lens rear cap: ALC-R1EM.



35 mm equivalent focal length (APS-C)*

60 mm

Angle of View (APS-C)*


Focal Length (mm)

40 mm


35 mm full frame

Lens Groups / Elements


Maximum Magnification ratio (x)

0.2x (AF), 0.23x (MF)

Maximum aperture (F)


Minimum Aperture (F)



Sony E-mount

Angle of View (35 mm)


Aperture Blades


Circular Aperture


Filter Diameter (mm)

49 mm

Minimum Focus Distance

0.92 ft (AF), 0.82 ft (MF) (0.28 m (AF), 0.25 m (MF))

Size & Weight

Dimensions (Diameter x Length)

2-3/4" x 1-13/16" (68 x 45 mm)


6.2 oz (173 g)


"35 mm equivalent focal length (APS-C)" and "Angle of View (APS-C)" refer to interchangeable lens digital cameras incorporating APS-C-type image sensors.



Sony FE 40mm f/2.5 E-Mount Prime G Lens Manual


You may also like

Recently viewed