Sekonic L-358

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The Sekonic L-358 Flash Master is an photographic exposure meter introduced by Sekonic in 2001.

The design of this meter is fairly rugged with a sealed housing making it water and moisture resistant, but it is not designed as a underwater meter. The LCD display is illuminated to ease readability in darker lighting conditions. Two ISO settings make it easier to use the meter for multiple cameras or formats. This model is also features a radio trigger method. With optional radio receiver (Sekonic RR4) and transmitters (Sekonic RR/RT32), you can trigger multiple flash units and get reading without an assistant or the mess of cords.

Standard accessories

  • Lumigrid
  • Soft case
  • strap
  • synchro terminal cap
  • 1x CR123A lithium battery


Measuring mode Incident light and reflected light
Light Receptors Incident: Convertible to flat diffuser (Lumisphere in down position)
Reflected: light receiving angle 54° (lumigrid)
Measuring element 2 Silicon photo diodes (incident and reflected)
Metering modes Ambient: Aperture priority, Shutter priority and EV metering.
Flash: with sync cord, without sync cord and radio
Measuring Range (ISO 100) Ambient
Incident: EV-2 to EV 22.9
Reflected: EV-2 to EV 22.9 (with 54˚lumigrid)
Incident: f1.0 to f90.9 (approx. F124)
Reflected: f1.0 to f90.9 (approx. F124) (with 54˚lumigrid)
Calibration Constant Incident light metering: Lumisphere C = 340 Flat diffuser C = 250
Reflected light metering: K = 12.5
Film speed ISO 3 to 8000 (in 1/3)
Shutter Ambient: 30 min to 1/8000 sec (in 1, 1/2 or 1/3) also 1/200, 1/400
Flash: 30 min to 1/1000 sec (in 1, 1/2 or 1/3) also
1/75, 1/80, 1/90, 1/100, 1/200, 1/400
Cine 2 to 360 fps (at a 180 degree shutter angle)
Aperture f/1.0 to f90.9 (in 1/10, 1/2 or 1/3 stop)
EV EV -9.9 to EV 40.1 (in 1/10 stop)
Analog display Aperture : f/1.0 to f90 (in 1/2 stop)
Shutter speed : 2s to 4k (1/4000) (in 1/2 stop)
Memory function 9 readings. memory clear. recall function
Second ISO film speed setting ISO 3 to 8000 (in 1/3 stop)
Battery 1x CR123A battery
Dimensions 60 w × 155 h × 37 d mm
Weight 153 g (with battery)