1. A jump rope, comprising:
a rope section having two ends;
a connector attached to one end of the rope section, the connector having a hook section, a middle section connected at one end to the hook section, and a flange section integral with the other end of the middle section;
an end cap attached to another end of the rope section;
a first handle having two open ends and a conical shape, one of the open ends having a smaller size fixedly connected to the end cap; and
a second handle having two open ends and a conical shape, one of the open ends having a smaller size configured to slide over the flange section of the connector and abut against the middle section of the connector allowing the connector to spin freely in the handle when the jump rope is in use and the connector is not connected to another jump rope, wherein when the jump rope is connected to another jump rope, the second handle can be locked to the first handle so as not to be sliding around on the jump rope when the jump rope is in use.
2. The jump rope according to claim 1, wherein the hook section comprises an open hook at one end form of a pliable plastic material that is hard enough to hold the connector to another connector on another jump rope, and soft enough to allow the open hook to flex when being connected to a hook section of another jump rope.
3. The jump rope according to claim 2, wherein the hook section is made of polyvinyl chloride.
4. The jump rope according to claim 1, wherein the handle is made of polyvinyl chloride, K-Resin or polyethylene.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A focus control apparatus to be provided to an image capturing apparatus to which an interchangeable lens is detachably attachable, the image capturing apparatus being configured to capture an object image formed by the interchangeable lens, the focus control apparatus comprising:
a focus detector configured to detect a focus state of the interchangeable lens; and
a controller configured to perform focus control of the interchangeable lens by using information obtained through the detection of the focus state and a correction value corresponding to the interchangeable lens,
wherein a first interchangeable lens and a second interchangeable lens, each of which is the interchangeable lens, are attachable to the image capturing apparatus, the first interchangeable lens holding correction value calculation data that is used to calculate the correction value and is unique to the first interchangeable lens, the second interchangeable lens not holding the correction value calculation data,
the focus control apparatus includes a first memory storing values for calculating the correction value corresponding to the second interchangeable lens, and
the controller is configured to:
perform, when the second interchangeable lens is attached to the image capturing apparatus, the focus control by using the correction value calculated based on the values read from the first memory; and
calculate, when the first interchangeable lens is attached to the image capturing apparatus, the correction value by using the correction value calculation data acquired from the first interchangeable lens and then perform the focus control by using the calculated correction value.
2. A focus control apparatus according to claim 1, further comprising a second memory configured to store the correction value calculated by using the correction value calculation data acquired from the first interchangeable lens,
wherein the controller is configured to perform, when the first interchangeable lens of which the correction value is stored in the second memory is again attached to the image capturing apparatus, the focus control by using the correction value stored in the second memory.
3. A focus control apparatus according to claim 1, wherein the correction value calculation data is data of an imaging position for each of at least one of a focal length of the first interchangeable lens, an object distance, and a spatial frequency and an image height of an object image formed by the first interchangeable lens.
4. A focus control apparatus according to claim 1, wherein the correction value and the correction value calculation data have data structures different from each other.
5. A focus control apparatus according to claim 1, wherein the correction value calculation data is data for calculating the correction value for a manufacturing error of the first interchangeable lens.
6. An image capturing apparatus to which an interchangeable lens is detachably attachable, the image capturing apparatus comprising:
a focus control apparatus; and
an image sensor configured to capture an object image formed by the interchangeable lens and convert the object image into an electric signal,
wherein the focus control apparatus comprises:
a focus detector configured to detect a focus state of the interchangeable lens; and
a controller configured to perform focus control of the interchangeable lens by using information obtained through the detection of the focus state and a correction value corresponding to the interchangeable lens,
wherein a first interchangeable lens and a second interchangeable lens, each of which is the interchangeable lens, are attachable to the image capturing apparatus, the first interchangeable lens holding correction value calculation data that is used to calculate the correction value and is unique to the first interchangeable lens, the second interchangeable lens not holding the correction value calculation data,
the focus control apparatus includes a first memory storing values for calculating the correction value corresponding to the second interchangeable lens, and
the controller is configured to:
perform, when the second interchangeable lens is attached to the image capturing apparatus, the focus control by using the correction value calculated based on the values read from the first memory; and
calculate, when the first interchangeable lens is attached to the image capturing apparatus, the correction value by using the correction value calculation data acquired from the first interchangeable lens and then perform the focus control by using the calculated correction value.
7. An interchangeable lens detachably attachable to an image capturing apparatus,
the image capturing apparatus comprising:
a focus control apparatus; and
an image sensor configured to capture an object image formed by the interchangeable lens and convert the object image into an electric signal,
wherein the focus control apparatus comprises:
a focus detector configured to detect a focus state of the interchangeable lens; and
a controller configured to perform focus control of the interchangeable lens by using information obtained through the detection of the focus state and a correction value corresponding to the interchangeable lens,
wherein a first interchangeable lens and a second interchangeable lens, each of which is the interchangeable lens, are attachable to the image capturing apparatus, the first interchangeable lens holding correction value calculation data that is used to calculate the correction value and is unique to the first interchangeable lens, the second interchangeable lens not holding the correction value calculation data,
the focus control apparatus includes a first memory storing values for calculating the correction value corresponding to the second interchangeable lens, and
the controller is configured to:
perform, when the second interchangeable lens is attached to the image capturing apparatus, the focus control by using the correction value calculated based on the values read from the first memory; and
calculate, when the first interchangeable lens is attached to the image capturing apparatus, the correction value by using the correction value calculation data acquired from the first interchangeable lens and then perform the focus control by using the calculated correction value,
the interchangeable lens comprising:
a lens memory storing correction value calculation data that is used to calculate the correction value and is unique to the interchangeable lens; and
a communicator configured to send the correction value calculation data to the image capturing apparatus.
8. A focus control method to be used for an image capturing apparatus to which an interchangeable lens is detachably attachable and which is configured to capture an object image formed by the interchangeable lens, the method comprising:
a detection step of detecting a focus state of the interchangeable lens; and
a control step of performing focus control of the interchangeable lens by using information obtained through the detection of the focus state and a correction value corresponding to the interchangeable lens,
wherein a first interchangeable lens and a second interchangeable lens, each of which is the interchangeable lens, are attachable to the image capturing apparatus, the first interchangeable lens holding correction value calculation data that is used to calculate the correction value and is unique to the first interchangeable lens, the second interchangeable lens not holding the correction value calculation data, and
in the controlling step,
the method performs, when the second interchangeable lens is attached to the image capturing apparatus, the focus control by using the correction value calculated based on values read from a first memory included in the image capturing apparatus; and
the method calculates, when the first interchangeable lens is attached to the image capturing apparatus, the correction value by using the correction value calculation data acquired from the first interchangeable lens and then performs the focus control by using the calculated correction value.
9. A non-transitory computer-readable storage medium that stores a focus control program as a computer program for causing a computer of an image capturing apparatus to which an interchangeable lens is detachably attachable and which is configured to capture an object image formed by the interchangeable lens, to perform an operation,
the operation comprising:
a detection step of detecting a focus state of the interchangeable lens; and
a control step of performing focus control of the interchangeable lens by using information obtained through the detection of the focus state and a correction value corresponding to the interchangeable lens,
wherein a first interchangeable lens and a second interchangeable lens, each of which is the interchangeable lens, are attachable to the image capturing apparatus, the first interchangeable lens holding correction value calculation data that is used to calculate the correction value and is unique to the first interchangeable lens, the second interchangeable lens not holding the correction value calculation data, and
in the controlling step,
the operation performs, when the second interchangeable lens is attached to the image capturing apparatus, the focus control by using the correction value calculated based on values read from a first memory included in the image capturing apparatus; and
the operation calculates, when the first interchangeable lens is attached to the image capturing apparatus, the correction value by using the correction value calculation data acquired from the first interchangeable lens and then performs the focus control by using the calculated correction value.