Zoom Lens

Zoom Lens

For Zoom Lens Deals Click The Blue Links Below
Where can I find a crank Zoom Camera Lens?

I know it is specific, but does anyone know a good video camera (microphone, or more than 15 x optical zoom) zoom with a crank? And this is not the kind of device that you find when you walk into Radio Shack no camera that takes pictures and videos, but as a smaller version of the film cameras with the crank, zoom? I do not have a photo alone, but I read that they had such things for the zoom.

Can you show us a picture? I do not remember seeing anything on a crank which camera ... there was a handle on some of the "original Zoomar" lenses used on TV cameras in the studio (who weighed more 1,000 pounds). These cranks were quickly dropped for the handles of the camera were the operator can control the zoom and has not had to use an assistant.

Aberration.

The inability of a lens to produce an accurate picture, particularly at the edge of a photography.
Usually, the more expensive the lens, the better its optical quality and less aberrations.

Angle

The area of a scene a lens can cover. The focal length of the target determines the angle of view. A wide-angle (short focal length) glass includes a scene more than a standard (normal-focal-) lens or telephoto (long-focal length) lens. Angle of view is fundamentally the angle at which light rays can pass through the prism to produce an image on film.

Aperture

The diaphragm is the opening formed by the blades of the iris diaphragm of the lens, through which passes the light to expose the film. Aperture Size is generally given f-number, the higher the number, more openness. Aperture Size set with a shutter speed determine the amount of light falling on film (exposure). The opening is sometimes called the "stop".

Aspherical lens

A lens with a curved, non-spherical surface. Used to reduce aberrations and to achieve a more compact lens size. With a spherical lens, rays from the periphery of the lens creating the image before the ideal focal point and gives a fuzzy center. With an aspheric lens, even rays from the periphery converge at the focal point lens ideal, producing a sharp image.

Chromatic aberration

The inability a lens to bring all wavelengths of light (especially red and blue) in the same business plan, causing a fuzzy set. Usually found regularly and openness telephoto and super telephoto lenses. Not improved by reducing the aperture size. Can be corrected with a low dispersion (ED, LD, SD) glass.

Color temperature

A way of expressing content and color quality of light, measured in Kelvin (K). "Daylight photographic" has a color temperature of about 5500K. Photography Tungsten lamps have color temperatures of 3200K to 3400k depending on their construction.

Depth of field

Distance between the nearest and farthest objects in a photograph that are considered acceptable edges. Depends on the opening, the focal length and focused distance. Opening the smaller, more objective and more focused distance, giving greater depth of field and vice versa.

Electronic flash

Designed to provide light where the lighting of the scene is insufficient. Electronic flash requires voltage, typically obtained with batteries and a voltage multiplier circuit which discharges a burst of intense short duration. Generally considered with the same photographic effect as daylight. Modern flash units have many features TTL exposure control and autofocus.

F-numbers or diaphragms

Numbers on the ring and opening the camera lens LCD (if any) which indicate the size of the lens opening. The higher the number is more openness. In sum, the scale, each number is multiplied by a factor of 1.4. Standard numbers are 1.0,1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, etc., each change resulting in a doubling or halving the amount light transmitted by the lens to the film.

Film Speed

ISO stands for International Standards Organization and figures such as ISO 100 or ISO 400 etc. give the film sensitivity to light. The higher the number, the more sensitive or faster the film. Basically, the slower film (ISO No bottom) clearer and clearer the picture. Grainy effect can be achieved with fast films (ISO no higher).

Flash sync speed

Exposure time with a focal plane shutter is measured from the moment the first curtain is released until the second curtain is released. The moment the first curtain closes, the electrical contacts for X sync close and fire the flash instantly.

Focal

The distance between the film optical center of the lens when the lens is focused at infinity. Focal length on most cameras Adjustable is marked in millimeters on the lens mount. The 35mm-format cameras, lenses with a focal length of 50mm are called normal or standard lenses. Lenses of 35 mm or less are called wide angle lenses and lenses of 85 mm or more are called telephoto lenses. Lenses which allow varying focal lengths without changing focus are called zoom lenses.

Lens

One or more pieces of optical glass or similar material designed to collect and transfer of light rays to form a sharp image on film, paper or projection screen. In practical photography, compound lenses made of a number of elements of different types of glass are used. This allows the manufacturer to correct most defects (aberrations) found in simple lenses and provide images that are accurate across the whole picture.

Lens Speed

Increased openness (smallest F-stop) at which a lens can be adjusted. Fast lenses transmit more light and have openings larger than slower lenses. Determined by the maximum aperture over the focal length. Lens speed is relative: a 400 mm lens with a maximum aperture of F/3.5 is considered extremely fast, while a 28mm F/3.5 lens is considered slow.

Perspective

Perspective is a two-dimensional representation of a scene in three dimensions. In photography this can be achieved by displaying 3D objects from an angle Rather than face. A photograph is also given if the prospect There are objects in the foreground, background and background, giving the whole scene "In depth".

Single-Lens-Reflex (SLR)

Light enters the camera through the lens is reflected a mirror behind the lens on a ground glass screen above. This screen is seen through the viewfinder and a glass pentaprism which turns the image the correct way up. Other camera functions such as light metering and flash control also operate through the lens of the camera.

Zoom Lens

A goal that can be adjusted to a wide range of focal lengths without a change of direction, an alternative for a number of individual targets of different focal lengths. One type of difficult goal to design and build, but very useful for the photographer who likes to travel light.

My name is Rene Waish, I am a hobbiest Photographer. I have intrest in photography snice my childhood. If you want to know more about me and photography please visit my blog at http://reenez.blogspot.com/

Nikkor 18-200mm VR zoom lens review

• Wide Zoom
• Wide Angle Lense

Tagged with: Angle Lens • Angle Lense • Camera Lens • Cameras • Film Camera • flash unit • format camera • ground glass • lcd • metering • Optical Zoom • photo lens • telephoto lens • Video Cam • Video Camera • Wide Angl • Wide Angle • Wide Angle Lens • Wide Angle Lense • Zoom Camera • zoom camera lens • Zoom Lens

Like this post? Subscribe to my RSS feed and get loads more!