Kenko KFM-2100 Flash Meter

Light Meter For Both Flash and Ambient Meter With Integrated Spot Meter

Kenko KFM-2100 Flash Meter

Flash Meter With Integrated Spot Meter

The Kenko KFM-2100 is an exposure meter that incorporates both flash and spot metering functions into one compact unit. 

The KFM-2100 can simultaneously display an exposure reading on the flash meter (for measuring incident light) and an exposure reading on the spot meter (for measuring reflected light). 

But its more than one simple easy-to-use integrated system that fits comfortably in your hand. It also incorporates the Exposure Navigation System, which displays information on the LCD that helps you determine the proper exposure for a scene. 

Exposure Navigation System 

The KFM-2100 allows you to confirm the exposure of each part of a scene being photographed. Conventionally, a photographer relies mainly on their experience and expertise when determining exposures. However, the KFM-2100 can emulate the decision making process on the LCD, guiding you to the exposure best suited to a particular photograph. 

Ergonomic and Stylish 

The KFM-2100 flash meter is a professional instrument that feels good in your hand and has controls that are logical and well laid out for ease of use. 

Ergonomic and Stylish 

Latitude is the degree to which you can over or under expose an image and still have acceptable image quality from the exposure. This concept is as critical with digital photography as with film. (Hint: Use your Digital Camera’s RAW setting for widest possible latitude also referred to as Dynamic Range, but a typical digital SLR's sensor has about a + or – 2 stop latitude range, making it similar to photographing with color negative film.) 

The latitude or difference in exposure between the brightest highlight areas of a scene and the darkest shadow areas can be determined by the KFM-2100 to make better informed lighting and exposure choices with the latitude function and built-in 1º spot meter. 

Note: Latitude and Dynamic Range can vary widely with different Digital SLR sensor types or different film types. Before using the KFM-2100 specify the correct latitude for the Digital camera or film being used.. 

*"Latitude" represents a film's effective exposure range. Normally, when a target object with extremely bright and dark areas is printed as a photograph, the bright areas are saturated with white and the dark areas are saturated with black. This phenomenon occurs when the 
contrast between the bright and dark areas exceeds the latitude of the film. 
Generally, color reversal films provide a latitude of about five stops.If the difference in brightness of the target object (difference in the spot meter's measured values) exceeds five stops, the bright and dark areas will be saturated white and black, respectively, when reproduced on film. 


The KFM-2100 can display digital readings, not just in the LCD on the front of the meter, but on in a LCD display in the viewfinder window as well. This allows light reading to be seen while still looking through the viewfinder. The meter also has dioptric adjustments for more comfortable viewing. 

Vertically Oriented LCD 

The KFM-2100 flash meter has a large, easy-to-read vertical LCD that displays F No. as a large number value with a 1/10 intermediate stop as a smaller number next to the full stop aperture value. Or, the meter can be set to display the aperture in _ or 1/3 stop increments. A vertical analog scale along the side of the display also provides the same aperture information when taking basic readings. 


The KFM-2100 flash mater has memory slots to store 10 separate readings. Both stored readings and the current reading can be displayed simultaneously in the vertical analog scale. Memory markers also show the number of stored readings. Having readings stored in memory makes it easier to analyze the contrast range of your subject, the lighting ratio or viewing several separate readings in relation to one another. 

Ambient Light Reading 

The KFM-2100 flash meter’s shutter speed can be selected in a range from as long as 30 minutes to as fast at 1/16,000 of a second (This range is selectable in full stop, _ stop or 1/3 stop increments). The light reading is displayed on the meter’s LCD window as both a digital and analog data. Once a reading is taken if you wish to change the shutter speed the aperture reading will automatically change accordingly. The KFM-2100 can read a very wide range of light from the very low equivalent EV -2.0 to 19.9 (incident light based on ISO 100). The meter can also be set to a Cine mode to be used with Cine cameras and display light readings from 8 to 128 frames/sec. 

Flash Light Reading 

When using with flash, select Cord or Non-Cord depending on the shooting conditions. For Cord setting, connect the Flash sync-cord to the Sync Terminal in the front of the FKM-2100 flash meter then a light reading can be taken by simply pressing the Measurement button on the side of the meter. When using a non-cord set-up, pressing the measurement button sets the meter in stand-by mode. When the flash is fired manually, the meter takes a reading. 

Analyze Function 

When taking readings in mixed flash and ambient lighting, the KFM-2100 can measure the flash and ambient light almost simultaneously. The percentage of flash in the over-all exposure is then displayed in the analyze scale on the LCD. The analyze scale is divided into 4 sections, each section represents flash contribution of approximately 25% of the total lighting. For example, if 3 sections of the analyze scale are lit, the flash to ambient light ratio is approx. 75% flash to 25% ambient. After taking a reading, the shutter speed can be changed and the meter will recalculate the exposure. Setting a slower shutter speed would result in a greater ambient to flash ratio. Setting a faster shutter speed would result in a lesser ambient to flash ratio. The analyze scale helps you balance the 2 sources of lighting for more predictable results, so you can set the lighting and exposure to get the look you want. 

Calculation Function 

The KFM-2100 flash meter has a calculation function that can be used to average readings stored in memory or bias exposures toward shadow or highlights when taking reflected light readings. This allows for more accurate recording of shadow or highlight detail. 


Kenko KFM-2100 Flash Meter


Names of Parts

  1. Receptor head Swivels 270° and accepts the Flat Diffuser
  2. Power button
  3. Viewfinder
  4. Spot (reflected-light) measurement button
  5. Incident-light measurement button
  6. Data panel Easy-to-read to give you the information you need at a glance.
  7. Up/down dial Used to set various values, such as ISO, shutter speed, calculation mode, etc.
  8. ISO button For setting the main ISO using the up/down dial.
  9. LATITUDE button Sets the Latitude display and monitor functions to standby.
  10. MODE button Changes the measuring mode.
  11. Instant-film ISO button For setting a secondary ISO (such as that of instant film for test shots) and displaying the exposure based on this ISO.
  12. Clear button Clears all measurement data from memory and cancels the standby status of the latitude display and brightness difference functions.
  13. S/A/H (shadow / average / highlight) button Sets the Flash Meter VI's calculation function; desired function is selected using the up/down dial. (Shadow / highlight available only for reflected-light measurements.)
  14. MEMORY button Stores the present measurement in memory. Up to 10 measurements can be stored.
  15. Sync terminal
  16. Battery chamber cover
Type Hand-held digital Exposure meter for ambient and flash light
Reception Method Incident-light readings and spot reflected light readings
Receptors Incident - Spherical diffuser, 270° Rotating receptor head
Spot - Spot optical system built-in to viewfinder with 1° measurement angle
Capable of displaying data on ambient and spot measurements simultaneously
Receptor Elements Silicon photocell
Measuring Modes AMBI - Ambient light
CORD - Flash w/ sync cord
NON-CORD - Flash without sync cord
Measuring Range Ambient light:
Incident : EV -2.0 to 19.9
Spot: EV 2.0 to 24.5 
Incident: F No. 1.0 to 128 +0.9 stop
Spot: F No. 2.8 to 128 +0.9 stop 
+/- 0.1 stop
Measuring Distance 4.2 ft (1.3m) to infinity
Optical System Single-lens reflect type with fixed focal point
Field of view 12 x 17° with 1° area marked by a circle
Magnification 1.2x
Eyepiece adjustment --3.0 to +1.0 diopters
Repeatability +/- 0.1 EV
Incident -C=330 (spherical diffuser), C-250 (flat Diffuser)
Spot K = 14
F Number F No. 1.0 to 128 + 0.9 stops (0.1 stop incr.)
EV value -17 to 40.9 (0.1 stop incr.)
Shutter speed -10 to +10 (0.1 stop)
Ambient 30 minutes to 1/16000 sec. (1, 1/2, or 1/3 stop increments
Flash 30 minutes to 1/1000 sec. (1, 1/2, or 1/3 stop increments
Frame Rate 8, 12, 16, 18, 24, 25, 30, 32, 64, 128 frames/sec
ISO sensitivity 3 to 8000 (1/3 stop)
Exposure Difference -10 to +10 (0.1 stop)
Analog Scale Ratio between Flash and Ambient 0 to 100% in 25% increments
Other Functions Latitude display function
Analyze function
Exposure Calculation function (S/A/H)
Memory function (up to 10 measurements)
Monitor function 
Indication correction function
Power one AA Alkaline dry-cell battery
Battery Life Approx. 30 hours continuous reading in AMBI mode
Operation Temperature range 15 to 120° (-10 to + 50 C) with 85% relative humidity
Dimensions 2.6 in (66mm) W x 6.9 in (175mm) H x 1.2 in. (31mm) D
Weight 6.0 oz. (170g) w/o battery
Standard Accessories Spherical diffuser, neck strap, case
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