JPS6123122A - Photographing method - Google Patents

Abstract

PURPOSE:To take a pan picture as the background of a sharp picture of a stationary object and obtain a picture with natural movement by emitting a flash a delay time after a shutter is fully open in daylight synchronized flash photography. CONSTITUTION:A strobe flash is put in operation by a delay light emitting device consisting of a counting circuit B which counts the number of waves of an oscillation circuit A started through the contact S of the camera shutter, time setting circuit C which outputs a signal when the counted value attains to a set time value, and a switch circuit D which operates a strobe flash circuit with the signal from the circuit C. The time setting circuit C sets the delay time corresponding to a shutter speed through a diode matrix and the delay time is 0.1- 1.0 time as long as the shutter full-open time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for taking photographs with a natural sense of motion using daytime synchronization flannel.

Recently, flash discharge lamps for photography, so-called strobe flashes, are often used, and the amount of exposure from normal light (light from the sun, lights, electric lamps, etc.) is made to be approximately the same as the amount of exposure from the strobe flash. So-called daytime synchronization photography is also often used, for example, when a moving subject is exposed with a relatively slow shutter speed (for example, a shutter speed slower than 1/125 second) using normal light and a 71 Roch flash. The image overlaps with a sharp still image exposed by a strobe flash with a fast flash duration of 1000 seconds or more, resulting in a clear and dynamic image. However, in this case, in the direction in which the subject moves, there is first a clear image produced by the light of the strobe flash, and in front of that (in the direction of movement) a moving image produced by normal light is projected. Images with this type of depiction can give a sense of movement, but when depicting a running object, it is usually best to create a shadow behind the main body to create a sense of movement. It was an extremely unnatural expression to project a moving image that flowed in the forward direction of the natural and clear image of the main body.

The present invention provides a strobe flash delay drive device between the strobe light emission contact of the shutter of a normal camera and a normal strobe flash, and sets a delay time according to the shutter speed to cause the strobe flash to emit light. When a moving subject is photographed during the day using a synchro flash, a flowing image that gives a sense of movement appears behind the clear image, giving a natural sense of movement.・ Conventionally, a strobe flash fires by triggering the strobe flash activation circuit using the strobe firing contact (X contact) on the camera shutter. Figure 1 shows the relationship between the shutter and strobe operation. The camera shutter starts operating at point B, the shutter fully opens at point 22, and at the same time, the strobe flash 1~re-power contact closes and the strobe flash operates, and it takes about 1/1000 seconds to reach point R1. A flash of light is emitted, the camera shutter begins to close at point 91 after being opened for a predetermined time, and Q
Complete the 2-point closing operation. If the camera shutter and strobe flash operate like this,
A clear image is projected by the strobe flash from point to point Rt, and then an image flowing in the direction of the subject's movement (forward) is projected by normal light until the shutter closes at point 92. On the other hand, the method according to the present invention has two
While the shutter opens at point 1 and closes at point 92, the image of the moving subject is exposed by normal light, but the strobe flash does not fire at point 22, and the strobe flash finishes firing at point 91, when the shutter begins to close. The light emission should start at two points with similar angles. In this way, a moving image of a moving subject exposed to normal light with a relatively slow shutter speed is first projected on the screen, and then the leading edge of the moving image in the light direction is B, and from period 2 to Ql. Since a clear still image is projected by the emitted strobe flash, the projected image is a moving image that is projected behind the clear still image of the subject, creating an image with a sense of movement that matches the usual idea. can be obtained.

Details will be explained below using examples.

As shown in the system diagram in Figure 2, there is an oscillation circuit A activated by the contact S of the camera shutter, a counting circuit B that counts the wave number of the oscillation circuit, and a counter circuit B that counts the wave number of the oscillation circuit. A strobe flash is activated by a delay light emitting device consisting of a time setting circuit C1 which outputs a signal to a switch circuit 1) which activates the Nutrobo flash circuit in response to a signal from the time setting circuit. It is preferable that one cycle of the oscillation wave is smaller than 1 m5 (E second),
The waveform may be one that can be counted by a counting circuit, and an OR oscillation circuit is used, but if accuracy is required, a crystal oscillation circuit may be used. The counting circuit usually uses a binary branching circuit. The time setting circuit usually uses a diode matrix to set the delay time corresponding to the shutter speed.If the delay time is tms%, the shutter speed is Tm3, and the flash duration of the strobe flash is Sms, then a lens shutter is used. In the case, t = (T-8) The value is set to .95, but it can be set to 0.99 or more if the period of the oscillation wave and the shutter speed are accurate. Also, depending on the intention of expression, 0.5
Although it may be set to below, if it is set to below 0.1, the present method has almost no effect. The light emission duration S of the strobe flash may be set to 1 to 21 TIS.

When the shutter is a focal plane shutter, consider the running time of the rear curtain, t = (T-8-R) Therefore, appropriate effects cannot be obtained unless the shutter model is selected.

When an OR charging (discharging) circuit is used in place of the oscillation circuit A, counting circuit B, and time setting circuit C shown in Figure 2, charging (discharging) starts when the shutter is fully opened and a certain voltage is reached. It is also possible to trigger the Nutsch circuit and adapt the delay time to the shutter speed by changing the OR constant or the operating voltage value.

A so-called Nutropoflash is suitable for the flash used in the present invention, but by combining a flash bulb and a suitable M contact or FP contact, and providing a flash activation delay device as described above, the same effect can be obtained. can be obtained.

In yet another embodiment of the photographing method of the present invention, a mechanical or electrical delay action contact is used in which the flash activation contact closes after a delay time corresponding to the shutter speed has elapsed after the camera shutter reaches full opening. A similar purpose can be achieved using a shutter equipped with .

As described above, the present invention enables daytime synchronized photography.
By emitting a flash of light with a lag time after the shutter is fully opened, it is possible to obtain images with a natural sense of movement that matches the normal human senses, something that has not been possible before.
This is a photography method.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the time relationship between the camera shutter and the operation of the stroboflange, and FIG. 2 is a system diagram showing an example of the stroboflange light emission delay circuit for implementing the present invention.

Claims (5)

[Claims] (1) By firing the strobe flash with a delay after the camera shutter reaches full open,
It allows you to express moving subjects with a natural sense of motion.
How to take synchronized photos during the day. (2) The photographing method according to item 1, wherein the strobe flash light emission delay time is in the range of 0.1 to 1.0 of the shutter fully open time. (3) When the strobe flash activation contact on the camera shutter closes, the timing circuit starts operating, and when the delay time set according to the shutter speed has elapsed,
The photographing method according to item 1, in which a strobe flash is activated. (4) The photographing method according to item 1, wherein the flash is other than a strobe flash. (5) The photographing method according to item 1, using a shutter equipped with a contact point that activates a flash after the camera shutter reaches full open and a delay time corresponding to the shutter speed has elapsed.