The Spectra Professional IV-A-SP Light Meter System from Spectra Cine is an accurate exposure measuring system for incident and 1° spot metering with a repeatable accuracy within 0.05 f-stops. It comes with a Photosphere for incident metering, a Photodisc for directional light, and a 1° PhotoSpot for spot metering.
This meter offers a wide sensitivity range, from f/0.35 to f/128, being able to register illuminance from 1 to 100,000 lux. And, when utilizing the spot metering mode, it has a measurement level from 0.1 to 70,000 footlamberts. This reading can be combined with exposure times from 1/8,000 second to 30 minutes or from frames rates between 2 to 360 for simple usage while shooting. Also, the head rotates 270° for versatility while measuring.
Additional features include a ratio mode and averaging. By utilizing the built-in memory of the meter, ratio mode can calculate the difference between two stored readings. It can then provide a reading in precise 1/10 stop increments. Also, the averaging of two readings, or continuous averaging is possible with this system as well.
The meter runs on an included 6-volt battery. Also packaged with the meter are a leather case, a hard carrying case, and a neck strap. Additionally, it features a calibration traceable to the National Institute of Standard Technology in Washington D.C.
In the Box
Spectra Cine Spectra Professional IV-A-SP Light Meter System
Limited 2-Year Warranty
Table of Contents
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Incident and 1° spot
Silicon photovoltaic cell
Digital f/stop: f/0.35 to f/128 in 1/10 stop increments
Analog bar graph f/shop: f/0.7 to f/45 in 1/3 stop increments
Footcandles: 0.1 to 70,000 fc
Lux: 1 to 100,000 lx
Footlamberts: 0.1 to 70,000 fl
1:1 to 999:1
Digital: 0.1 stop
Analog: 0.2 stop
3 to 8,000 in 1/3 stop increments
Frame Rates Supported
Exposure Time Range
1/8,000 sec to 30 min
Within 0.05 f/stop
2 readings with option to average
1 x 6V A544, PX28L, or PX28 Battery
5.5 x 2.5 x 2.0" (14.0 x 6.4 x 5.0 cm)
6 oz (170 g)
Spectra Cine Spectra Professional IV-A-SP Light Meter System Review