Patent Publication No. 2011-123336
- 2011.6.23 Release Date
- 2009.12.11 filing date
- Related 2011-123334
Example 1
- f =- 124.47mm
- = 1.95 magnification
Example 9
- f =- 251.89mm
- = 1.80 magnification
- Rear attachment lens
- Master a longer focal length
- Smaller than the front converter
- Because of the negative refractive power and degrade the curvature
- Without a diaphragm
- Beam passes through the upper and lower
- Can not compensate for the aberrations caused by light passing through the off-axis
- Magnification chromatic aberration only expanded
- Correcting the axial chromatic aberration in the most object side lens group, to compensate for inadequate performance of the chromatic aberration and curvature of the most image-side lens group
- Diffractive optics (DO lens = Diffractive Optics)
- For example, the material is UV cured resin, wavelength 530nm design degree
- Diffraction efficiency decreases at wavelengths other than orders for the design and will not require light fraction decreased, causing a flare
- Transmittance is reduced when used in multiple locations
Patent Technology
- Positive refractive power as a whole, group 4 consists
- Applicable to telephoto and telephoto zoom
- Share in compensating the chromatic aberration of magnification and lens and the next most image side lens
- Multi-layer diffractive optical element
- Than 95% diffraction efficiency across the visible light
Source [EG]
thanks Evgenii
cr
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