External Flash with Wireless Radio Control

External Flash with Wireless Radio Control

Shoot masterfully illuminated photos thanks to the flash unit's guide number (GN) 451 regardless of its compact body and wireless radio control system. Since the flash is also equipped with an LED light for stills and movies, you can make the most of the camera's still and video capabilities. Dust and moisture-resistant design2 lets you use the flash outdoors without worry.
External Flash with Wireless Radio Control

High-power compact flash

This dramatically downsized3 compact lightweight clip-on flash with guide number (GN) 451 is best suited to use with the α7 series. The flash supplies powerful output even for bounce lighting, recycling only takes approx. 2.5 seconds4, and stamina in performance delivers up to approx. 210 bursts4.

Built-in wireless radio control

Use this flash with a compatible camera5, for multi-flash shooting, even under strong sunlight or from relatively distant locations thanks to its radio-controlled system. HVL-F45RM can be either wireless commander or receiver. As a commander, HVL-F45RM supports up to 15 units of compatible flashes or receivers in up to 5 groups6, for connecting with remote units at up to 98 feet7. It also works with optical wireless communications.

Bounce head for flexible lighting

HVL-F45RM bounce head for flexible lighting rotates 360° horizontally (180° in both left and right directions) and also tilts 150° upward and 8° downward, providing the illumination you want depending on shooting situations.

Quick Navi

Sony's Quick Navi control interface provides easy, intuitive access to lighting parameters via one easy press of the 'Fn' button. Everything you need to know is right there on the screen and accessible using a few buttons and the control wheel, thereby minimizing the necessary operations required to adjust settings before you shoot.

Customizable key assignment

Key customization function allows easy assignment of frequently used features for quick operation. Customizable settings include lighting compensation level and flash output level. Customizable keys are highlighted in red.

Tab-structure menus

You'll enjoy effortless operation of flash features. Tab-structure menus on the LCD screen are the same as those on the camera body for fast access and intuitive use.

LED light and AF illuminator8

Cool running and energy efficient, the LED light enables you to create natural lighting and shadows for both movies and stills. Plus, AF illuminator8 supplies fill light to focus more easily on a subject in dark surroundings.

High-speed sync (HSS)

Take advantage of synced flash with high-speed shutter. Whereas conventional sync shooting requires that the shutter speed be the same or slower than the synced flash speed, the aperture would be narrowed, making it difficult to get background bokeh effects. But with high-speed sync (HSS) you can use flash with any shutter speed, even up to the highest shutter speed provided by the camera. This allows you to increase the aperture as needed to create a narrow depth of field that keeps your subject in perfect focus while the background blurs, for beautiful portraits. Wireless high-speed sync is also possible with compatible cameras.

Dust and moisture-resistant design2

Count on reliable flash even in challenging outdoor conditions with specially designed seals at joints around the durable body to keep out dust and moisture2. This is a particular bonus in outdoor usage where you have no control over various factors including wind and environmental dust.2.

Through-the-Lens (TTL) wireless flash

Even when performing wireless flash shooting, flash output can be determined based on accurate measurement of the amount of light through the lens. Since you can freely change the position and direction of the flash unit exactly as you want, it's possible to soften intense shadows and suppress blown highlights when shooting a subject from right in front (of the subject), or add soft shadows that emphasize a sense of depth and presence. Wireless flash ratio control is available.

Advanced Distance Integration (ADI)5

ADI provides automatic metering that is virtually unaffected by the reflectance of subjects or backgrounds, maintaining correct exposure even with overly reflective or overly dark subjects. It pre-flashes the unit to incorporate the reflected light measurement, together with precise distance information from a compatible camera's lens, to achieve the optimum flash level.

Test flash mode

The test flash mode enables you to check shadows on the subject before taking photos, and also to check the light level using an external flash meter, which is essential for studio photography. The light level of the test flash depends on the light level setting in manual flash (M) mode, and the flash unit fires with a light level of 1/1 in through-the-lens (TTL) mode.

Auto zoom control optimized for image sensor size9

This flash unit automatically selects the appropriate flash coverage for the focal length of the lens on the attached camera within the range from 24 mm to 105 mm. This function also adjusts the flash zoom to match the camera's image sensor size, minimizing light fall-off at the image periphery. The flash coverage required for cameras using 35 mm full-frame and APS-C size image sensors differs substantially, and this intelligent function automatically provides the optimum flash coverage for each.

Auto White Balance Adjustment9

Color temperature varies according to the environment you're shooting in, and the color temperature of a flash should match that of the ambient light to look natural. With this intelligent function, color temperature information is transferred from the flash unit to the camera for correct white balance setting, to help you capture more natural-looking color reproduction in flash photography.

Multi/Micro USB port

This flash features Multi/Micro USB port for supporting software update to the latest version via connected PC.

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Basic information
Dimensions (approx.) W 2-3/4 in × H 4-1/2 in × D 3-1/2 in (69.4 mm × 113.7 mm × 88.3 mm)
Weight (approx.) 11.2 oz (317 g) (only main unit)
Type Auto electronic flash (clip-on type) with pre-flash metering
Shoe type Multi Interface Shoe.
Flash head (light-emitting unit)
Maximum guide number 45 (Flash coverage setting 105 mm/STD flash distribution, ISO100・m)
Flash coverage AUTO/MANUAL (24 mm–105 mm) angle of view at 15 mm focal length is also covered with the wide panel
Flash Duration (Approx.) Within 1.7 ms (1/1 MANUAL)
Color Temperature (Approx.) 5,500 K
Frequency (Approx.) 0.1-2.5 seconds (Alkaline battery)/0.1-2.0 seconds (Ni-MH battery)
Repetition (approx.) More than 210 times (Alkaline battery)/More than 270 times (Ni-MH battery)
Continuous flash performance 40 flashes at 10 flashes per second10
Bounce flash Yes
Bounce angle Up 150 deg (0 deg/30 deg/45 deg/60 deg/75 deg/90 deg/120 deg/150 deg) Down 8 deg, Left and right 180 deg (0 deg/30 deg/45 deg/60 deg/75 deg/90 deg/120 deg/150 deg/180 deg)
Test flash Yes
Flash control Flash control using pre-flash (P-TTL/ADI)
Flash compensation Yes11
Power level switching 22 levels (1/1-1/128) 1/3 steps
High-speed sync (HSS) Yes
Modeling flash Yes
Built-in wide panel Yes (0.59 in)
Built-in bounce sheet Yes
AF illuminator
AF illuminator Yes11
Operating Range (Approx.) 1.64-19.69 ft12
Radio-controlled wireless function
Radio Control Wireless Function Yes (commander/receiver)13
Frequencies 2.4 GHz band
Channels 14 Channels (Auto/manual)
Communication Distance (Approx.) 98.43 ft14, 15
Groups 3 groups (TTL/MANUAL), 5 groups (group flash photography)
Maximum flash units 15 units
Lighting ratio control 3 groups (TTL)
Optical control wireless function
Optical Controlled Wireless Flash Yes (controller/remote)16
Channels 4 Channels
Communication Distance (Approx.) 16.4 ft14, 15
Groups 3 groups
Lighting ratio control 3 groups (TTL)
LED light function
Center Luminance Intensity (Approx.) 400 lx (1.64 ft)/100 lx (3.28 ft)
Lighting Distance (Approx.) 3.28 ft (when recording movies, set to ISO 3200 & F5.6)
Focal length supported 35 mm (35 mm-format angle of view)
Continuous Lighting Time (Approx.) 4 hours (with Sony AA-size alkaline battery)
Color Temperature (Approx.) 5,500 K
Power level switching 10 steps
Other functions
Auto zoom control optimized for image sensor size Yes17
Flash distribution setting Yes
Auto WB Adjustment Yes17
Custom key settings Yes
Memory settings Yes
Remote release -
LCD panel Yes (Dot matrix)
Charge progress indicator -
External connectors
Sync terminal -
Multi/Micro USB terminal Yes
Power source
Power source Four AA-size alkaline or Ni-MH batteries
External Battery Adaptor -
Other features
Dust and moisture-resistant design Yes

  • Connector protect cap (1)
  • Mini-stand(1)
  • Carrying case (1)
  • 18