Sunday, 24 January 2010

Wednesday, 20 January 2010

MILLION MANSION FOR SALE - Luxury Homes in Georgia: Atlanta

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Krystle throws Alexis out of the Carrington mansion

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Saturday, 16 January 2010

A Guided Tour in Yuri Arcurs' Photo Studio

A Guided Tour in Yuri Arcurs' Photo Studio
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Yuri Arcurs on Studio Essentials

Stock Photography With Yuri Arcurs - On the Photo Shoot!

Friday, 15 January 2010

The phase velocity (or phase speed) of a wave is the rate at which the phase of the wave propagates in space. This is the speed at which the phase of any one frequency component of the wave travels.
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refractive index

The refractive index (or index of refraction) of a medium is a measure of how much the speed of light (or other waves such as sound waves) is reduced inside the medium. For example, typical soda-lime glass has a refractive index close to 1.5, which means that in glass, light travels at 1 / 1.5 = 2/3 the speed of light in a vacuum. 2 properties of glass and other transparent materials are directly related to their refractive index. First, light rays change direction when they cross the interface from air to the material, an effect that is used in lenses. Second, light reflects partially from surfaces that have a refractive index different from that of their surroundings.
So refractive index is measure of how much speed of light is reduced inside a medium such as glass etc:

The Refractive Index of Water

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longer focal length or lower optical power is associated with larger magnification of distant objects

In telescopy and most photography, longer focal length or lower optical power is associated with larger magnification of distant objects, and a narrower angle of view. Conversely, shorter focal length or higher optical power is associated with a wider angle of view. In microscopy, on the other hand, a short objective lens focal length leads to higher magnification.
So that is why when the lens goes out more, there is greater magnification it is like Far sighted
Focal length is longer. for greater magnification. http://isleofmanmansions.blogspot.com/

focal length

The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (defocuses) light.
For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. A system with a shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more strongly, bringing them to a focus in a shorter distance.

Optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. It is equal to the reciprocal of the focal length of the device. The dioptre is the most common unit of measurement of optical power. The SI unit for optical power is the inverse metre (m^-1).

For two or more thin lenses close together, the optical power of the combined lenses is approximately equal to the sum of the optical powers of each lens. Similarly, the optical power of a single lens is roughly equal to the sum of the powers of each surface. These approximations are commonly used in ophthalmology.

When a lens is immersed in a medium, its optical power and focal length change.

An eye that has too much or too little refractive power to focus light onto the retina has a refractive error. A myopic eye has too much power so light is focused in front of the retina. Conversely, a hyperopic eye has too little power so when the eye is relaxed, light is focused behind the retina. An eye with a refractive power in one meridian that is different from the refractive power of the other meridians has astigmatism. Anisometropia is the condition in which one eye has a different refractive power than the other eye.

chromatic aberration

In optics, chromatic aberration (also called achromatism or chromatic distortion) is the failure of a lens to focus all colors to the same point. It occurs because lenses have a different refractive index for different wavelengths of light (the dispersion of the lens). The refractive index decreases with increasing wavelength.

Chromatic aberration manifests itself as "fringes" of color along boundaries that separate dark and bright parts of the image, because each color in the optical spectrum cannot be focused at a single common point on the optical axis.

Since the focal length f of a lens is dependent on the refractive index n, different wavelengths of light will be focused on different positions. Chromatic aberration can be both longitudinal, in that different wavelengths are focused at a different distance from the lens; and transverse or lateral, in that different wavelengths are focused at different positions in the focal plane (because the magnification of the lens also varies with wavelength).

isle of man mansions

Some tricks learnt so far

1. Get on side sun is shining on.
2. Video can be used when bird near,
3. Focus
4. Take quickly

purple fringing

In photography, and particularly in digital photography, purple fringing is the term for an out-of-focus purple ghost image on a photograph. Images taken with high-contrast boundary areas involving daylight or gas discharge lamps are particularly susceptible, since chromatic aberration is worst for the shortest wavelengths that a camera is sensitive to (violet and/or ultra-violet light).
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