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Sekonic L-398A Studio Deluxe III

Cat # 401-399

The Sekonic L-398A Studio Deluxe III has been a mainstay of working photographers and cinematographers for four decades running. Small, compact, and easy to use, the Sekonic L-398A incorporates a battery-less amorphous photocell, which enables you to take accurate ambient light readings anywhere, anytime.

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Overview Specifications Features


Items Include:

L-398A Case, Strap, Lumidisc, Lumigrid and High Slide

The Sekonic L-398A's swivel head allows you to hold down the metering button and "walk the set" to check light levels. Release the button, and the needle locks down the meter's analog display needle for easy-to-read exposure calculations. Exposures are displayed for both still and cine applications.

Incident measurements can be taken with the over 180-degree Lumisphere for general readings of three-dimensional objects, or with the Lumidisc selective area readings, measuring the lighting ratios between highlights and shadow areas or light falling on flat-field objects such as artwork, measurements outdoors or under bright studio lights.

For reflected readings, a flat Lumigrid replaces the Lumisphere. If you plan on shooting with a fixed ISO and shutter speed, an optional Slide Set (Direct Reading Slides) that make it easier to take readings in fast-paced shooting scenarios. The Sekonic L-398A Studio Deluxe III makes an ideal prime or back-up meter for still or motion picture shooters.


Weight0.4 lbs. (0.2 kg)
Exterior Dimensions2.3W X 1.3H X 4.4D in.
(5.8 X 3.3 X 11.2 cm)
TypeAnalog exposure meter for ambient light
Receptor HeadRotating Domed Head 90° to the right, 180° to the left, Retractable for Contrast Reading
Light Receiving MethodIncident light and reflected light
Receptor Incident LightInterchangeable Lumisphere and Lumidisc
Receptor Reflected LightInterchangeable Lumigrid
Light Receptor ElementAmorphous silicon photocell
Measuring Modes Ambient LightAperture priority metering - Shutter priority metering - EV metering
Measuring Range (ISO 100) Ambient LightIncident light: EV 4 to EV 17 - Reflected light: EV 9 to EV 17
Repeatability (Repeat Accuracy)(+/-) 0.3 EV or less
Calibration Constant IncidentLumisphere C = 340
Calibration Constant ReflectedK = 12.5
Display Range Film SpeedISO 6 to 12000 (in 1/3 stops)
Display Range Shutter Speeds Ambient60 seconds to 1/8000 second (in 1, 1/2 or 1/3 stops)
Display Range Aperturef/0.7 to f/128 (in 1, 1/2 or 1/3 stops)
Display Range EVEV 1 to EV 20
Display Range Cine Speeds fps8 fps -128 fps
Display Range Analog Scale Aperturef/0.7 to f/128 (in 1, 1/2 or 1/3 stops)
Display Range Analog Scale Shutter Speed 60 seconds to 1/8000 second (in 1, 1/2 or 1/3 stops)
Display Range Analog Scale EVEV 1 to EV 20
Auto Power OffYes
Battery Power Indicator DisplayBattery Capacity Checker Button and Guide Needle
Battery (Power)Self-powered: Selenium photocell eliminates need for batteries



  • The industry standard for incident light measurement
  • Swivel head and needle lock facilitate easy and accurate readings
  • Amorphous silicon photocell eliminates need for batteries
  • Lumidisc for adjusting illumination contrast and measuring intensity
  • Lumigrid for measuring reflected light
  • Memory pointer retains prior reading


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