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Leica SF 40 Wireless TTL Flash Unit Compact — main product image
Leica SF 40 Wireless TTL Flash Unit Compact
Leica SF 40 Wireless TTL Flash Unit Compact
Leica SF 40 Wireless TTL Flash Unit Compact
Leica SF 40 Wireless TTL Flash Unit Compact
Leica SF 40 Wireless TTL Flash Unit Compact
Leica SF 40 Wireless TTL Flash Unit Compact
Leica

Leica SF 40 Wireless TTL Flash Unit Compact

★★★★★3.5 (13 reviews)

Leica's compact SF 40 flash delivers wireless TTL accuracy with a powerful guide number and built-in LED video light.

$491.49*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Leica SF 40 is a purpose-built flash unit tailored for photographers shooting with Leica M Type 240 and Vario digital cameras. With a guide number of 131 feet at ISO 100 and 105mm, it delivers more than enough power for indoor events, portraits, and fill flash outdoors, all in a compact housing that respects the understated profile of Leica bodies. TTL metering ensures accurate automatic exposures, removing the guesswork from flash photography and letting you focus on composition and timing.

Beyond standard flash duties, the SF 40 includes a built-in LED video light with 9 adjustable output levels — a genuinely useful feature for video shooters or photographers who want a continuous light source for focusing in dim environments. The zoom head covers 24mm to 105mm and extends to 16mm with the included diffusion panel, matching most focal lengths in the Leica system. The package includes an external diffuser, soft case, and flash stand, so the unit is ready for both on-camera and off-camera wireless TTL use right out of the box.

Key Features

External Diffuser

Soft Case

Flash Stand

Specifications

Brand
Leica
Model
SF 40
Compatibility
Leica M Type 240 & Vario Digital Cameras
TTL Support
Yes (Wireless)
Guide Number
131' at ISO 100 and 105mm
Zoom Range
24–105mm (16mm with diffusion panel)
Video Light
LED with 9 output levels
Included Accessories
External Diffuser, Soft Case, Flash Stand

Pros & Cons

👍 Pros

  • Compact and lightweight design integrates well with Leica's rangefinder body style
  • Guide number of 131 feet at ISO 100 provides strong output for a flash this size
  • Built-in LED video light with 9 brightness levels adds continuous lighting versatility
  • Wireless TTL capability enables off-camera use without sacrificing automatic exposure
  • Wide zoom range from 24–105mm with a 16mm diffusion panel covers ultra-wide to telephoto

👎 Cons

  • Limited compatibility to Leica M Type 240 and Vario cameras restricts use across other systems
  • Premium price point consistent with Leica accessories, significantly more than third-party alternatives
  • No swivel or tilt head mentioned, which may limit bounce flash options in some environments

Frequently Asked Questions

The SF 40 is designed for Leica M Type 240 and Vario digital cameras. It communicates via the hot shoe for full TTL metering support with these models.
Yes, the SF 40 supports wireless TTL operation, allowing you to use it off-camera for more creative lighting setups while maintaining automatic exposure control.
The flash head covers a zoom range of 24mm to 105mm, and extends to 16mm coverage when the built-in diffusion panel is deployed.
Yes, the built-in LED video light operates independently of the flash and offers 9 output levels, making it useful for video recording or as a modeling light when composing shots.

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