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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
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  • 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

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  • Conversion lens device and photographing system having the conversion lens device
  • Conversion lens device and photographing system having the conversion lens device
  • Conversion lens device and photographing system having the conversion lens device

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]

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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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B15/12
Inventor 小方康司
Owner OM DIGITAL SOLUTIONS CORP
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