In another word known as photographic lens or objective is an optical lens used in conjunction with a camera body. It is a mechanism that make images of objects.
What is focal length?
The focal length of the lens is distance between the lens and the image sensor, the distance is in millimeters. Most of the people think that focal length is a measure of how long or short a lens is physically, but as I said it is a distance between the optical center of a lens and the imagining sensor.
What is the connections between focal length and angle of view?
When you take a picture you should definitely pay attention to focal length and angle of view. The focal length is a picture that has part of the picture thrown away and the viewing angle is similar to the portion of the scene that the lens can capture it is measured in degrees. If your lens is more angular then the portion of the scene is greater.
What is Crop Factor?
Lenses usually have circular image and the sensor records a rectangular portion of the scene and the rest of the image is not important, it is cut from the photo and this is known as Crop Factor. The opposite of crop factor is full-frame picture, it is a picture that has the full picture that was taken, nothing was taken off from the picture.
What is Optical Zoom?
Optical zoom is usually used on digital cameras. It is a essential part of a camera and it helps to take a closer picture of an object. It allows you to zoom in or out.
What is Aperture?
It is an opening of a lens, gap through which light passes in a lens. The lens aperture influences depth of field but it also affects image quality. Every lens have two or three aperture settings that can improve the final image and make it the sharpest image that you can make from your camera. It is also important which camera you buy because every camera has different aperture, more expensive cameras have better aperture which provides a better quality picture.
How to take the best night shot you can
It is really difficult to take a perfect picture when it is dark outside, everything is transformed into a glittering spectacle. For taking photos of the night sky you have to switch your camera into night photography, this settings will help you to take the best picture of the night sky, but only if your camera has this type of mode, if it does not I would recommend you to buy a new camera, which has these modes. Another great tool you need to have is a tripod, which can help you to take a really sharp picture. If you attach your camera to a tripod it is easier because when your hands can shake while you are taking a picture and the final picture is terrible. Another tip is to choose a good location usually somewhere on the hill or high ground. Enable mirror lock-up for sharp picture because your camera can shake and the mirror lock-up avoid potential pitfall. You can find this function in your setting.
What is depth of field?
For photographers it is very important to understand the depth of field. It is a connections of aperture, focal length and focusing and all together they affect the depth and control sharp of your photos. Every photographer knows that camera can only focus its lens on one single point, but the depth of field is a area of a photo that stretches of and behind focus point and is still sharp. It can be described also as shallow in which only a narrow zone appears sharp or also known as deep – more of the photo appears sharp.
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