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[Concept]
Actually consists of a high-power flash and modeling lamp.
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[Structure]
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[Flash tube]
General ring, the center of the ring interface modeling lights
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Modeling lights
Is generally quartz lamps, incandescent lamps, etc..
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[Used]
Modeling lights also do lighting light source used to shoot without flash
When using the flash, the modeling lights just play cloth look at the shape of the effect with
Some modeling lights turn off when the flash fires, flash fires and then light up, to interfere in order to prevent the color temperature of the modeling lights flash. But for quartz lamp, incandescent thermoluminescence doing is meaningless. If one is afraid to modeling lights on the color temperature of interference by light cloth is complete, turn off the power of the modeling lights shooting.
General studio light power can be adjusted, whether the level adjustments, as well as sub-file adjustments.
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[Power specifications]
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1, [nominal flash energy (Flash Power)
The size of the flash energy directly reflects the strength of the flash light force.
Factors do not look accessories (such as reflectors, etc.), the greater the output energy, the stronger the light force. Energy Watts · sec (WS) or joules (J) of the units
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[Exposure Index calculation and determination] (GN m @ ISO100)
Exposure Index (GN) is calculated directly based on the output energy (E)
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3, Color Temperature (Color Temperature)
The color temperature is one of the important parameters of studio flash.
The ideal color temperature can make photos to achieve the perfect color effect.
If the color temperature is too high, the color bluish; color temperature is too low, then the color partial orange or even reddish.
Daylight film, a color temperature of 5400K. General 4950K ~ 5600K allows color temperature to (ideal value 5250K).
The main factor is the impact of studio flash color temperature of the flash cycle, the anode voltage and studio flash intrinsic quality (such as stability and attenuation).
Advanced design and manufacturing excellent studio flash in the output file, use the initial and subsequent changes in the color temperature should not be great.
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4, [flash duration] (Flash Time)
Flash duration based on ISO, marked t = 0.5.
Theoretically this curve at 1/3 peak time interval called a ring flash tube flash duration.
The general ring flash tube flash duration 1ms about. This value is not only associated with the lamp, and also related to the circuit design.
Same flash tube, a flash duration depends mainly on Cu value (i.e., electric capacity and voltage values ??of the product) This constant. Therefore, for the same output power studio flash context, the use of a small number of high-withstand voltage capacitors studio flash, flash duration than a number, a short low breakdown voltage capacitor studio flash.
In addition, the size of the resistance value on the studio flash energy path, will also impact the flash duration.
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[Advantages]
Studio lighting photography, in a dark studio, almost all of the light source from the the on hand Jizhan studio flash, the direction of the light, color, brightness completely in their own hands, shooting photos than more gorgeous in natural light scene.
Studio flash and external flash on the effect of the difference between
Compare camera external flash and studio flash shooting.
Using the camera external flash shooting directly at the subject.
Despite TTL control, but the overall feeling is very flat, very blunt, there is no sense of hierarchy, the shaded area is relatively concentrated, in the face of ugly shape.
2 studio lights to outline the contours of the characters, the subject of the three-dimensional sense of very obvious.
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Commonly used cloth, light law]
A real studio lights law
2 backlight lamp method
3 hard light singles Law
4 plain glass lamp method
5. Butterflies light law
6 top light reflector lamps law
Single lamp method of painting effects
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Common dimming method]
1, to adjust the number of main capacitor, for example, semi-file flash half capacitance participate, have a capacitance of 1/4 1/4 Draw participate flash;
2, adjusting the value of the voltage on the main capacitor, and participate in the flash capacitor number unchanged, adjusting the value of the charging voltage of the main capacitor, and more for the stepless dimming type flash;
3, the use of high-speed SCR flash off discharge, adjust the flash intensity according to the turn-off time.
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【Article is excerpted from: Baidu Encyclopedia】
【Network reprint / Just reference】
【Translation is by Goolge】
