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Keks KF-01 Flash (Silver)

BH #KEKF01SILVER • MFR #KF-01 SILVER
7 reviews
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Keks KF-01 Flash (Silver)
Key Features
  • Portable On-Camera Flash
  • Guide Number: 39.4'
  • 3 Output Levels: 1, 1/2, 1/3
  • Recycling Time: 1.5-8 sec
The distinct silver KF-01 Flash from Keks is a simple and compact on-camera flash with basic features. Known for plenty of light meters, Keks has now developed a shoe-mounted flash with a guide number of 39.4' and three power output levels. Its elegant, sleek, and modern aluminum-constructed design will spark joy atop your camera.
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Keks KF-01 Overview

The distinct silver KF-01 Flash from Keks is a simple and compact on-camera flash with basic features. Known for plenty of light meters, Keks has now developed a shoe-mounted flash with a guide number of 39.4' and three power output levels. Its elegant, sleek, and modern aluminum-constructed design will spark joy atop your camera.

Output
The flash's output level can be easily adjusted: 1, 1/2, and 1/3. Intuitive controls and indicators facilitate local adjustments.
Recycle & Power
The KF-01 operates on two separately available AAA batteries. It supports approximately 300 flashes with a recycle time that can vary from 1.5 to 8 seconds.
Sync Connection
The unit also features a PC sync port for connecting an optional sync cable. The KF-01 offers compatibility with many vintage cameras.
Other Details
The back of the flash features an easy-to-read exposure chart, which is a convenient asset for film photographers.
UPC: 198715770087

Keks KF-01 Specs

Key Specs
Guide Number
39.4' / 12 m
Bounce/Vertical Adjustment
No
Swivel/Horizontal Adjustment
No
Exposure Control
Manual
Wireless Operation
No
Internal Power
2x AAA (Not Included)
Off-Camera Terminal
PC
Flash Head
Guide Number
39.4' / 12 m
Bounce/Vertical Adjustment
No
Swivel/Horizontal Adjustment
No
Recycle Time
Approx. 1.5 to 8 Seconds
Secondary Illumination
No
Exposure Control
Exposure Control
Manual
Power Range
1/1 to 1/3
Wireless
Wireless Operation
No
Power
Internal Power
2x AAA (Not Included)
External Power Pack Compatible
No
General
Mount
Shoe
Off-Camera Terminal
PC
Mobile App Compatible
No
Dimensions (W x H x D)
2.6 x 2.2 x 0.9" / 67 x 57 x 22 mm
Weight
Not Specified by Manufacturer
Packaging Info
Package Weight
0.355 lb
Box Dimensions (LxWxH)
5.4 x 3.5 x 1.7"

Keks KF-01 Reviews

Great little flash

By Asher C
Rated 5 out of 5
Date: 2025-09-11

This flash sits very sturdy on my camera's hotshoe, it does not wiggle around at all when mounted. The metal build feels high quality. I use it on my Leica M3, Nikon FM2, and various digital cameras. I use a 3.5mm jack to PC sync cable for my film cameras and it works great. Please note that on some film cameras you will need to tape down the metal contact on the flash to allow the PC sync cable to work properly. Great flash, super happy with the results and very simple to use!

UPDATED REVIEW: Keks Stepped In - Great Service!

By David L
Rated 5 out of 5
Date: 2025-01-14

I was way too quick to post my initial review, and am hoping B&H will take it down soon... I initially had issues with the first unit I received, but after the Keks customer service team got involved and explained their exchange process, things got a lot better. They have been SUPER responsive with me, and are sending a new unit. I was able to use my friends KF-01 flash over the weekend and it was super easy to use, and I can't wait to test out my replacement! Thank you to the Keks customer service team for a great experience!

See any errors on this page?

What’s the applied voltage by the flash?

What’s the applied voltage by the flash?
Asked by: Sheyenne
There is no published voltage available for the Keks KF-01 Flash (Silver), but it's designed as a modern low-voltage flash, compatible with modern mirrorless cameras and film cameras.
Answered by: Boyd H
Date published: 2026-03-05

What’s the applied voltage of the flash unit?

What’s the applied voltage of the flash unit?
Asked by: Sheyenne
The Keks KF-01 Flash (Silver) works with 2x AAA batteries with a voltage of 1.5V.
Answered by: Jessica G
Date published: 2026-03-05

Is this flash compatible with digital Leica M ...

Is this flash compatible with digital Leica M cameras? Specifically the M240?
Asked by: Jonathan
Yes, the manual Keks KF-01 Flash (Silver) is compatible with the Leica M (Type 240) Digital Rangefinder Camera through the center pin.
Answered by: Rachael B
Date published: 2024-12-08

Is this compatible with the Leica q2?

Is this compatible with the Leica q2?
Asked by: Michael Orgill
The Keks KF-01 Flash (Black) has a center pin hot shoe. It will fire when the shutter is pressed and will only communicate in manual modes.
Answered by: Davis H
Date published: 2024-12-26

What is the widest 35mm lens that this flash will ...

What is the widest 35mm lens that this flash will cover (that is the field of coverage)?
Asked by: Richard A
The field of coverage of the Keks KF-01 Flash is unofficially approximately equal to that of a 50mm lens on a 35mm camera or full-frame digital camera.
Answered by: Boyd H
Date published: 2025-11-23

Can I use this with my Fujifilm X100f?

Can I use this with my Fujifilm X100f?
Asked by: Thomas
Yes, the Keks KF-01 Flash (Black) will work on any camera with a center pin hot shoe. The Keks KF-01 Flash (Black) operates in manual mode.
Answered by: Davis H
Date published: 2025-02-06

What is the field of coverage?

What is the field of coverage?
Asked by: Robert
The Keks KF-01 Flash (Black) does not have any zoom functions, and the manufacturer does not list the focal length or spread of the flash.  It is a small, limited flash and is not made for long-distance use. The flash's maximum measurement is approximately 50 mm.
Answered by: Rob K
Date published: 2025-12-31
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