How To Use A Light Meter In Studio Photography

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Low-cal Meters Quick Guide

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Contents

  • 1
    Precautionary Statements
  • 2
    Media Loan Light Meters
  • 3
    Reflected Light Readings
  • 4
    Grey Carte du jour Readings
  • 5
    Incident Low-cal Reading
  • six
    Measurement for Pic Camera

    • 6.1
      Motion Picture Camera Shutter Speeds
  • 7
    Sekonic Studio Deluxe Light Meters

    • 7.1
      Accessories

      • 7.1.one
        Lumisphere
      • seven.i.ii
        Lumigrid
      • vii.1.iii
        Lumidisk
      • 7.1.4
        High Slide
    • 7.2
      Zeroing the Light Meter
    • 7.iii
      Taking a Lite Reading
    • 7.four
      Reading the Meter
    • 7.5
      Filter Adjustments
    • 7.6
      EV Window

      • 7.half-dozen.1
        Exposure Value or light Value
  • 8
    Sekonic Flashmate Digital Meters

    • 8.1
      Setting the Film Speed
    • viii.ii
      Incident Lite Measurement
    • 8.3
      Reflected Light Measurement
    • eight.4
      Mail Measurement Calculation
    • eight.5
      Measuring Range
    • 8.six
      Measurement for Flick Photographic camera
  • 9
    Tundra D3B Light Exposure Meter

    • 9.1
      Setting the Pic Speed
    • 9.2
      Selecting the Correct Sensitivity Range
    • 9.3
      Low-cal Measurements

      • 9.3.one
        Reflected Calorie-free Measurement
      • 9.three.two
        Incident Lite Measurement
    • 9.iv
      Exposure Value Settings

Precautionary Statements

Lite meters are delicate instruments, handle with care!

Practice not open, take apart, drop or handle roughly!

Keep the strap around your neck when using the meter.

Scratches can collect clay which may slightly reduce lite transmissions and bear on the meter’south accuracy.

Practice not expose meters to magnetic fields, extreme heat, humidity, exit in a locked auto or betrayal to direct sunlight for periods of time.

Proceed the meter in its case when not in employ.

Media Loan Light Meters

Media Loan carries 3 bones types of light meters. Sekonic and Tundra analog meters, and a Sekonic digital meter.

Reflected Light Readings

Reflected Low-cal Readings All of Media Loan’s light meters will read reflected light, which is the light reflected off a subject (see epitome right). With the Lumigrid accessory, the Sekonic analog meters will measure the light reflected from a scene. The Loftier Slide cannot be used with the Lumigrid accessory for a reflected light reading. Sekonic digital meters and Tundra meters require you lot to slide the sphere accompaniment to betrayal the window beneath. Use for landscapes and other distant objects.

Greyness Carte du jour Readings

To go an accurate reflected calorie-free reading, use an 18 percent grey ‘Neutral Examination Card’ as a substitute for your bailiwick. This card is peculiarly made to reflect eighteen percent of the low-cal falling on information technology, the equivalent of a middle gray on a scale between white and black. The meter volition read the grey card as the platonic boilerplate scene. If using a gray card is non possible, measure out the reflected light from an appropriately lit field of study which closely approximates this middle grey tone. (Media Loan does not have gray cards.)

Incident Lite Reading

Incident low-cal is the intensity of calorie-free coming from the source (sun, room calorie-free, etc.) and falling on a subject that can be measured. This is the equivalent of an eighteen percent greyness reading. Use for people and close objects.

Measurement for Picture show Camera

The process for taking measurements when using a moving picture photographic camera is the same every bit for taking ambient low-cal measurements.

Pic Camera Shutter Speeds

Standard frames per second = 24 FPS. Wearisome move = 36 FPS or higher. Fast Motion = eighteen fps or lower.

Shutter Speeds (at 24 FPS unless otherwise noted):

Bolex

1/80th of a second
1/65th of a second (with RX lenses)
1/30th of a second (single frame without RX lenses)

CP-16

1/55th of a 2nd

Oxberry Animation Stand 0.25 second
(single frame)

Sekonic Studio Deluxe Calorie-free Meters

The Sekonic light meter functions as a dual purpose exposure meter, reading either incident or reflected (luminance) light. This professional, versatile instrument is designed, still, to give the virtually accurate exposure information based on incident light readings.

Accessories

Lumisphere

Shaped like a dome, the Lumisphere attachment simulates the curvature of a human face. Position it over the light sensor on the meter’s swivel head. The Lumisphere may simply be used for incident light readings.

Lumigrid

When an incident light reading cannot be taken (distant landscapes, wild animals, etc.), apply the Lumigrid accessory to mensurate reflected light. Reflected light measurement with the Lumigrid accessory is possible only when the intensity of the reflected light exceeds 125 foot candles.
As well, all Lumigrid readings are measured with the scarlet ‘H’
arrow without the High Slide inserted. This accessory works well for reading illuminated or neon subjects.

Lumidisk

The Lumidisk measures illumination when pointed from the subject directly at an private calorie-free source. Information technology is oft used for blitheness stand and low-cal table work to measure light coming through dorsum lit glass. The Lumidisk is as well used to measure out the difference between key and make full lights when trying to achieve specific contrast ratios as in close up, studio photography. Documenting these lighting ratios will allow you to control contrast for later duplication of the same scene or light quality. Knowing the dissimilarity ratio is as well of import because photographic films accept varying and express light sensitivity ranges. Colour film, for example, is limited to a iv F-stop exposure range, the equivalent of a xvi:1 contrast ratio. If the brightest expanse in a shot reads 160 foot candles, the darkest areas cannot read beneath ten foot candles. Exceeding the 16:ane ratio would launder out highlights and blacken shadow details. To decrease dissimilarity ratios, add low-cal to night areas and/or reduce light in bright areas.

High Slide

Under brightly lit conditions (when the meter needle pegs to the right) inserting the High Slide into the slot on the top of the swivel head will convert the Sekonic to ‘loftier illumination measurement’ and readings will be measured in using the ‘H’ pointer. When the High Slide is not in utilise, readings should exist measured using the ‘L’ arrow. (Except when using the Lumigrid as previously explained.) When the High Slide is not being used, shop information technology in the meter’s back.

Zeroing the Light Meter

Before taking a reading, make sure the meter is zeroed. To do this:

Hold the light meter upright and eliminate all light reaching the sensor by roofing the light port in the swivel head with your hand. This may be done with an accessory installed. Press the needle lock push and release information technology. The needle should point to zero on the incident light calibration. If information technology doesn’t, return the meter to Media Loan and ask to accept the meter zeroed.

Taking a Light Reading

Install the appropriate accessory by matching the white dots and turning the accessory clockwise until it stops. Select the motion picture speed by turning the center dial until the appropriate ASA is indicated in the index window (ASA is the same as ISO). Bespeak the Sekonic’southward sensor from the area you lot want to be ideally exposed, on a line of axis with the camera lens. Be careful not to block low-cal from the sensor. Push the needle lock button and release it. The needle will lock into reading position.

Reading the Meter

The needle will point to a foot candle number on the incident scale. Turn the outer dial until the white ‘L’ arrow corresponds to the human foot candle number indicated by the needle. If the needle moves across the incident scale (pegs right), as mentioned in the accessories section, insert the High Slide re-measure the low-cal, and line upward the outer dial number with the red ‘H’ pointer. To determine the F-finish consult the Shutter Speed Scale on the bottom of the meter . Cull the shutter speed at which you will shoot. The right F-cease volition be located below the shutter speed.

Filter Adjustments

When using filters on your camera, the aperture may demand to permit more lite onto the movie plane. Discover out the factor for the filter you’re using and consult the X1/ii, X2, and X4 symbols on both sides of the cherry ‘H’ and ‘Fifty’ pointers to increase or decrease exposure. For instance, to double exposure for a filter factor of ii, rest the X2 symbol (on the right side of the ‘L’ or ‘H’ pointer) nether the pes candle number corresponding to your reading.

EV Window

Exposure Value or light Value

This number system is sometimes used to supplant the traditional shutter speed and F-finish combinations and is used only with cameras equipped with an Eastward.V.S. calibration.

Sekonic Flashmate Digital Meters

Setting the Film Speed

Pressing down the
ISO
button, push up or down buttons to alter setting.

Incident Lite Measurement

For measuring ambient calorie-free, mount the lumisphere to swivel head. Switch the meter ON and indicate lumisphere to the camera from the position where subject is to be measured. Press measuring switch then measured value of F-stop or EV is displayed.
For measuring illumination dissimilarity, mountain the lumidisc and switch the meter ON. Betoken the lumidisc directly toward center of main light. Press measuring switch in EV style and read-out the measured value. In the same manner, read the EV number of fill-in calorie-free. Divergence between EV numbers of main and backup lights becomes dissimilarity ratio.
For measuring luminance (Lux) set the ISO sensitivity to ISO 100 regardless of your picture show speed. Place the lumidisc parallel with the measured surface and read EV number in the same style as for other measurements.

Reflected Low-cal Measurement

Mount the lumigrid and switch the meter ON, so point the lumigrid directly toward part of subject to exist measured. Measure reflected light from main indicate of subject field as close as possible to the subject field. Use adequate care in this case that the meter shadow does non interfere with the light to be measured.

Post Measurement Calculation

Adding dependent upon change of film speed can be made by pressing either side of Upwards/Downward key while depressing ISO selecting key.
Adding dependent dupon change of shutter speed can be made by pressing either side UP/DOWN key only.
Conversion of measuring mode can exist made past pressing F/EV selecting key.

Measuring Range

When measuring range is exceeded, F-stop or EV number will exist replaced with Due east.o (error-over) or E.u (mistake-under) mark.

Measurement for Movie Camera

The procedure for taking measurements when using a film camera is the same every bit for taking ambient calorie-free measurements.

Tundra D3B Low-cal Exposure Meter

Setting the Film Speed

Rotate the inner dial knob (16) until the speed (ISO or DIN) of your flick appears opposite the reference mark in the appropriate window (xiii) or (fourteen).

Selecting the Correct Sensitivity Range

To measure subjects illuminated by normal or bright calorie-free sources, push the alter-over switch (eight) and slide it to the center position so that high light range scale (v) is seen in the window. Depress the operating push (nine) and read the figure on the high light range calibration. When metering dim or poorly illuminated scenes, the actress sensitive low light range scale (half dozen) should exist used. Push the change-over switch (8) and slide it to the height setting and then that the low low-cal range scale (6) is seen in the window.

Notation that the white numbers in the window chronicle to the Low lite range and the yellow numbers relate to the Loftier light range.

Light Measurements

Reflected Light Measurement

Ensure that the white plastic diffuser (2) does not cover the CdS cell window (1). Betoken the meter towards the bailiwick, tilting the meter sufficiently downwardly, if used outdoors, to avoid measuring sky areas which would inflate the reading and cause underexposure.

Push the operating push (9) and hold it until you have noted the reading indicated past the pointer.

Once the number has been noted by the meter pointer, move the outer dial (15) so that the corresponding number effectually the edge of that dial is in line with the index mark (19). Any combination of shutter speed and aperture opposite each other on the dial will give the same correct exposure.

Incident Light Measurement

With this method the low-cal that is falling on a subject field is measured.

The color contrast or effulgence of the discipline itself does non influence the reading when using this method. This type of light measurement is specially recommended when the subject has excessive dissimilarity.

Slide the white plastic diffuser (2) over the CdS prison cell window (1). Identify the meter at the subject field position and indicate the CdS cell towards the camera or lite sources. Take the reading as explained in the previous section for reflected calorie-free measurements.

Exposure Value Settings

For cameras calibrated in exposure values (EV) readings can be directly fabricated from the scale in the EV number window (17).




Source: https://helpwiki.evergreen.edu/wiki/index.php/Light_Meters_Quick_Guide

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