Conversion lens device and photographing system having the conversion lens device
A lens and optical system technology, applied in the field of shooting systems, can solve problems such as small magnification and inability to use new camera systems
Inactive Publication Date: 2019-08-16
OM DIGITAL SOLUTIONS CORP
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
These rear teleconversion lenses are premised on a longer flange backing, so cannot be used with the new camera systems mentioned above
On the other hand, the rear telephoto conversion lens disclosed in Patent Document 3 is a rear telephoto converter suitable for a camera system with a short flange backing, but the magnification is small.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0446] unit mm
[0447] surface data
[0448]
[0449]
[0450] Image surface
[0451] Distance from the main lens = 3.2632
[0452] Various data (unlimited)
[0453]
Embodiment 2
[0455] unit mm
[0456] surface data
[0457]
[0458]
[0459] Image surface
[0460] Distance from the main lens = 2.2632
[0461] Various data (unlimited)
[0462]
Embodiment 3
[0464] unit mm
[0465] surface data
[0466]
[0467]
[0468] Image surface
[0469] Distance from the main lens = 1.2632
[0470] Various data (unlimited)
[0471]
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The present disclosure is directed to a converter lens device that includes a first mount to which a master lens device is capable of being attached, a second mount to which a camera body is capable of being attached and a converter lens having a negative refractive power, wherein, an optical system comprising the converter lens device and the master lens device has a focal length longer than a focal length of an optical system of the master lens device, the converter lens comprises sequentially from an object side, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, and a third lens unit.
Description
technical field [0001] The present invention relates to a conversion lens device for obtaining an optical system having a focal length longer than that of an optical system of a main lens device and an imaging system having the conversion lens device. Background technique [0002] Conventionally, a conversion lens is known as an optical system for changing the focal length of a main lens. The conversion lens is mounted on the object side of the main lens or the image side of the main lens when used. A conversion lens mounted on the image side of the main lens is called a rear conversion lens. [0003] Two mounting parts are provided in the conversion lens device having the rear conversion lens. One mount portion is a mount portion corresponding to the mount portion of the main lens device, and the other mount portion is a mount portion corresponding to the mount portion of the camera body. [0004] When the conversion lens unit is used, the conversion lens unit is sandwic...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B15/12
Inventor 小方康司
Owner OM DIGITAL SOLUTIONS CORP