Abstract: A sharing extension point receives a request from a host application for sharing content, the sharing extension point being one of the extension points of an extension framework of an operating system, each corresponding to a common interface to extend a predefined functionality of one application to another application. In response, a sharing extension capable of providing content sharing services is launched. Data representing a share sheet created by the sharing extension is injected into a content viewer within the host application as a share sheet clone, where the share sheet clone has a reduced resolution image of the content displayed therein. In response to receiving a commit command for sharing, the actual content is retrieved from the host application and the retrieved content is transmitted to the sharing extension to enable the sharing extension to post the share sheet on a sharing platform.

Abstract: A sharing extension point receives a request from a host application for sharing content, the sharing extension point being one of the extension points of an extension framework of an operating system, each corresponding to a common interface to extend a predefined functionality of one application to another application. In response, a sharing extension capable of providing content sharing services is launched. Data representing a share sheet created by the sharing extension is injected into a content viewer within the host application as a share sheet clone, where the share sheet clone has a reduced resolution image of the content displayed therein. In response to receiving a commit command for sharing, the actual content is retrieved from the host application and the retrieved content is transmitted to the sharing extension to enable the sharing extension to post the share sheet on a sharing platform.

Abstract: A sharing extension point receives a request from a host application for sharing content, the sharing extension point being one of the extension points of an extension framework of an operating system, each corresponding to a common interface to extend a predefined functionality of one application to another application. In response, a sharing extension capable of providing content sharing services is launched. Data representing a share sheet created by the sharing extension is injected into a content viewer within the host application as a share sheet done, where the share sheet done has a reduced resolution image of the content displayed therein. In response to receiving a commit command for sharing, the actual content is retrieved from the host application and the retrieved content is transmitted to the sharing extension to enable the sharing extension to post the share sheet on a sharing platform.

Abstract: A sharing extension point receives a request from a host application for sharing content, the sharing extension point being one of the extension points of an extension framework of an operating system, each corresponding to a common interface to extend a predefined functionality of one application to another application. In response, a sharing extension capable of providing content sharing services is launched. Data representing a share sheet created by the sharing extension is injected into a content viewer within the host application as a share sheet clone, where the share sheet clone has a reduced resolution image of the content displayed therein. In response to receiving a commit command for sharing, the actual content is retrieved from the host application and the retrieved content is transmitted to the sharing extension to enable the sharing extension to post the share sheet on a sharing platform.

Abstract: A sharing extension point receives a request from a host application for sharing content, the sharing extension point being one of the extension points of an extension framework of an operating system, each corresponding to a common interface to extend a predefined functionality of one application to another application. In response, a sharing extension capable of providing content sharing services is launched. Data representing a share sheet created by the sharing extension is injected into a content viewer within the host application as a share sheet clone, where the share sheet clone has a reduced resolution image of the content displayed therein. In response to receiving a commit command for sharing, the actual content is retrieved from the host application and the retrieved content is transmitted to the sharing extension to enable the sharing extension to post the share sheet on a sharing platform.

Abstract: A base, securely attachable to any type of watertight housing for an underwater camera without causing rotational displacement during its use for underwater photography, includes an elongated main body and a holder plate disposed on the main body which is transversely movable. The base has a protrusion for preventing transverse motion of a pedestal or a leg structure on the housing. A pair of set screws is provided in addition to a fixing screw that is passed through a fixing hole through the base main body to fasten the base to the camera housing. The base main body has a fixing hole for the fixing screw and a pair of elongated holes for passing the set screws so as to be transversely movable. The holder plate has an elongated hole for passing the fixing screw so as to be transversely movable and screw holes for engaging the set screws.

Abstract: A base, securely attachable to any type of watertight housing for an underwater camera without causing rotational displacement during its use for underwater photography, includes an elongated main body and a holder plate disposed on the main body which is transversely movable. The base has a protrusion for preventing transverse motion of a pedestal or a leg structure on the housing. A pair of set screws is provided in addition to a fixing screw that is passed through a fixing hole through the base main body to fasten the base to the camera housing. The base main body has a fixing hole for the fixing screw and a pair of elongated holes for passing the set screws so as to be transversely movable. The holder plate has an elongated hole for passing the fixing screw so as to be transversely movable and screw holes for engaging the set screws.

Abstract: A wide converter lens system includes an assembly of two or more specified kinds of lens units and a meniscus concave lens to be attached in front of this assembly. The frame for this assembly is detachably attachable to a watertight underwater housing containing a camera in a non-airtight, non-watertight manner so as to increase the field angle of the camera. The assembly of lenses includes at least a plano-concave lens with its flat surface facing forward away from the camera and a plano-convex lens with its flat surface facing the camera. In between, there may be any number of lenses such as an achromatic double lens combination for correcting distortions and aberrations of different types. The meniscus concave lens is provided with a sealing mechanism for detachably attaching itself to the front part of the frame of the lens assembly and serves to further increase the field angle of the camera in water.

Abstract: A wide converter lens system includes an assembly of two or more specified kinds of lens units and a meniscus concave lens to be attached in front of this assembly. The frame for this assembly is detachably attachable to a watertight underwater housing containing a camera in a non-airtight, non-watertight manner so as to increase the field angle of the camera. The assembly of lenses includes at least a plano-concave lens with its flat surface facing forward away from the camera and a plano-convex lens with its flat surface facing the camera. In between, there may be any number of lenses such as an achromatic double lens combination for correcting distortions and aberrations of different types. The meniscus concave lens is provided with a sealing mechanism for detachably attaching itself to the front part of the frame of the lens assembly and serves to further increase the field angle of the camera in water.

Abstract: A flash lamp for underwater photography has at least two straight discharge tubes mounted to a panel perpendicularly to each other in a T-form or an L-form such that a circular target area can be illuminated. A plurality of smaller capacitors and transformers for these discharge tubes can be arranged inside a watertight housing in a space-efficient manner. The mode switching circuit for selecting between automatic and manual modes of operation is designed such that a single mode selecting switch needs to be operated in order to select a mode. A slave flash lamp has a more reliable control circuit having one or two light receiving circuits for detecting light from a master and outputting a corresponding light sensing signal, a start signal output circuit and a stop signal output circuit for analyzing the received light signal and analyzing it to detect start and stop signal elements and to output a start signal and a stop signal for causing flash light to start emission and to stop it.

Abstract: A flash lamp for underwater photography for use in combination with a camera has a target light, which may be a laser diode or a focussed LED and is set so as to emit a beam of light coaxially with its flash light source such that the user can visually ascertain where the lamp will illuminate. The lamp is controlled such that the target light is automatically switched off or made darker approximately simultaneously as the shutter of the camera is opened. If the flash lamp is of a kind which undergoes preliminary flash light emission prior to main flash light emission, the target light is controlled so as to be switched off or made darker by using the preliminary light emission as the trigger. If the camera is of a kind that outputs a ready signal when its shutter is pressed to a half-way position to indicate that it is ready to be clicked completely, the ready signal may be used as the trigger for switching off or darkening the target light.

Abstract: A flash lamp for underwater photography for use in combination with a camera has a target light, which may be a laser diode or a focussed LED and is set so as to emit a beam of light coaxially with its flash light source such that the user can visually ascertain where the lamp will illuminate. The lamp is controlled such that the target light is automatically switched off or made darker approximately simultaneously as the shutter of the camera is opened. If the flash lamp is of a kind which undergoes preliminary flash light emission prior to main flash light emission, the target light is controlled so as to be switched off or made darker by using the preliminary light emission as the trigger. If the camera is of a kind that outputs a ready signal when its shutter is pressed to a half-way position to indicate that it is ready to be clicked completely, the ready signal may be used as the trigger for switching off or darkening the target light.

Abstract: A flash lamp for underwater photography has at least two straight discharge tubes mounted to a panel perpendicularly to each other in a T-form or an L-form such that a circular target area can be illuminated. A plurality of smaller capacitors and transformers for these discharge tubes can be arranged inside a watertight housing in a space-efficient manner. The mode switching circuit for selecting between automatic and manual modes of operation is designed such that a single mode selecting switch needs to be operated in order to select a mode. A slave flash lamp has a more reliable control circuit having one or two light receiving circuits for detecting light from a master and outputting a corresponding light sensing signal, a start signal output circuit and a stop signal output circuit for analyzing the received light signal and analyzing it to detect start and stop signal elements and to output a start signal and a stop signal for causing flash light to start emission and to stop it.

Abstract: An underwater camera housing for enclosing a camera for use with a flash unit has a cable connector to which a signal-transmitting cable extending to the flash unit is attached and a link switch is provided on its outer surface by which the transmission of signals through the cable can be cut off or connected again. The signal transmitted through the cable may be electrical signals or light signals. If light signals are transmitted from the housing to control the flash unit, a circuit is provided for generating an electrical signal to prepare the camera for flash photography and the link switch serves to control the generation of this electrical signal such that the camera can be prepared selectively either for flash or natural-light photography.

Abstract: A camera for underwater photography may be used together with one or more flash lamps each capable of serving both as a main lamp and as a slave. The camera is connected through its housing to a main lamp by way of an optical cable and when it is clicked, a control signal is emitted as a light signal and transmitted to the main lamp through the optical cable. The flash lamp has a photosensing unit for receiving a light signal and converting it into an electrical signal. A signal conversion circuit further converts this signal into a flash control signal by which the lamp flashes light. The photosensing unit is connected to the optical cable through a connector and receives light only through the cable when the connector is attached to it. When the lamp is used as a slave, the connector for the optical cable is detached from the photosensing unit and external light received through a transparent window is converted into an electrical signal for the emission of flash light.

Abstract: A water-proof lens port to be attached to a water-proof camera case for a camera for underwater photography has a cylindrical water-proof main structure for enveloping the lens of the camera, a front window for allowing light from outside to reach the camera lens, an inner magnet ring containing magnets and affixed to the adjusting ring on the lens-barrel of the camera inside so as to rotate together, and an outer magnet ring containing magnets and supported rotatably around the cylindrical main structure. The inner magnet ring and the outer magnet ring are coupled to each other magnetically through a portion of the main structure in between by the force between these magnets contained in the inner and outer magnet rings such that the adjusting ring can be rotated by adjustingly rotating the outer magnet ring outside the main structure of the lens port. Such a lens port is attached to the front part of a camera case covering the main body of the camera.