JPH0224832U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of essential parts of a close-up photography device with a flash equipped with a close-up flash control device according to an embodiment of the present invention, and FIG.
A graph showing the relationship between the position in the optical axis direction and magnification regarding subject distance and depth of field. Figure 3 is a graph showing the relationship between the film surface and the photographing optical system when the subject is the reference. Figure 4 is a graph showing the relationship between the film surface and the photographing optical system when the subject is the reference. A block diagram of the above-mentioned flash control device, FIG. 5 is a graph showing the flash light emission intensity at each time from the start of light emission to the end of light emission, and FIG. 6 is a graph showing the relationship between the flash guide number and time of the light emission characteristics shown in FIG. FIG. 7 is an example of a block diagram for stopping light emission at time t in order to control the flash according to the calculated guide number. 1...Camera body, 2...Film, 3...
Close-up lens, 3a... Lens body, 4... Subject, 5... Body holding tube, 6... Lens holding tube, 7
... Fixed tube, 7a ... Mounting part, 8 ... Magnification setting ring, 9, 10 ... Pin, 12 ... Tripod, 13 ...
...Lens support member, 14... Encoder, 15...
...ROM, 16...Subject holding surface, 17...Brush, 20...Irradiation distance information, 21...F number information, 22...Magnification information, 23...Photographing F number setting section, 24...Effective F number Arithmetic unit, 25
...Light emission start switch, 26...Light emission amount calculation section.

Claims (1)

[Claims for Utility Model Registration] (1) A close-up photographing device having a flash 11 and in which the distance L between the subject 4 and the light emitting part 11b of the flash 11 is constant regardless of the photographing magnification; Lens information output means 1 which is a close-up flash control device for controlling the amount of light emitted by lens 11, outputs irradiation distance information 20 corresponding to the irradiation distance L, and outputs photographing magnification information 22 of the lens of the close-up photographing device.
5 and F number information 21 according to the change of F number.
F-number information output means 15 that outputs the photographic magnification information 22 outputted from the lens information output means 15 and the F-number information output means 1.
a calculating means 24 for calculating an effective F number from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 output from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21 outputted from the F number information 21;
number, the subject 4 output from the lens information output means 15, and the flash light emitting unit 1.
control means 2 that calculates the amount of flash light emission from the irradiation distance information 20 between
6. A close-up flash control device comprising: 6. (2) The F-number information is an equivalent F-number, and the lens information output means 15 outputs information indicating the setting range of the equivalent F-number, and the F-number information output means 21 outputs information indicating the setting range of the equivalent F-number. A close-up flash control device according to claim 1, which outputs F-number information within the flash control device. (3) The above equivalent F-number information also includes pupil magnification information.
The flash control device for close-up photography described in . (4) The above-mentioned close-up photography device includes a first holding member 6 that holds the close-up lens 3, and a second holding member 6 that holds the camera body 1 that has the recording surface 2 that records the image of the subject 4.
a holding member 5, and the first and second holding members 6, 5;
a third holding member 7 that movably holds the macrophotography lens 3 along the optical axis direction of the close-up lens 3 and movably supports the first holding member 6 and the second holding member 5; Alternatively, the first holding member 6 and the second holding member are attached to the third holding member 7 so that the photographing magnification can be changed while always maintaining a close focus state in which the image of the subject 4 can be confirmed in the viewfinder of the camera. The flash 11 is removably attached to the third holding member 7 to adjust the irradiation distance L between the subject 4 and the flash light emitting unit 11b.
A flash control device for close-up photography according to any one of claims 1 to 3, which is configured to maintain a constant value.