Understanding digital zoom and the optical zoom

Talk about 「introduction lens, lens focal length 」 is a camera shot of one of the most important characteristics, in order to allow traditional photographers easily understand consumer-level digital camera lens of significance, we are often converted into equivalent focal length 135 camera. 「Cold lens 」 refers to parallel rays after passing through the lens, the focal point of the collection to the distance between the lens. Basically, if it is

Talk about 「introduction lens, lens focal length 」 is a camera shot of one of the most important characteristics, in order to allow traditional photographers easily understand consumer-level digital camera lens of significance, we are often converted into equivalent focal length 135 camera.

「Cold lens 」 refers to parallel rays after passing through the lens, the focal point of the collection to the distance between the lens. Basically, if it is the position of the camera body, lens focal length and objects using the magnification will render a proportional relationship.

Namely: magnification = image size/absorbed body size optical zoom

So, like the Nikon CoolPix 990 digital camera lens focal length is 38 mm-115mm (the equivalent of 135 camera), we would say that it is 3X of optical zoom, meant that the original lens for 38 mm, a lens system with telescopic changes, the maximum you can adjust the lens focus to 115mm.

At the same shooting distance, you will be taken three times the volume amplification.

Digital zoom digital cameras today have evolved into a small computer with operating system in General, internal, you can do one of the established procedures.

Through the firmware on the program's calculus and optical systems, we can be taken in making local amplification to interpolation mode simulation out Optical Zoom effect. 「Cold digital zoom 」 will wear out image quality, in the General conditions of shooting, we do not recommend using 「introduction digital zoom 」. But we also know 「introduction poor photo 」 than 「introduction no photo 」, in certain special circumstances, we will spend 「introduction digital zoom 」.

Optical zoom VS digital zoom optical zoom of the image quality is better than digital zoom, please try to take the optical zoom function.

Optical zoom and digital zoom calculation: If a camera's optical zoom as 3X, digital zoom for 4X, the camera combined with optical zoom and digital zoom function, you can reach the enlarged capacity 12X (though ... This is not very practical).

Fixed focus and zoom no matter what factories camera, 「introduction zoom 」 features the same will result in the loss of image quality, therefore, a sibling of a digital camera/lens system, lens 「introduction focusing 」 taken as a result, should be better than lenses 「business zoom 」 also sharp!, on the other hand, the lenses 「business focusing 」 easier design, lower cost, but in the composition, no 「introduction zoom 」 lens so convenient.

Increasing distance lenses for the same reason, 「introduction increase from microscopic 」 usage increased amplification rate, may result in image quality decreases, in General, we recommend users to try not to use more than 2X of 「introduction increase from microscopic 」.

However, the use of 「introduction increase from microscopic 」, the effect will still be better than 「introduction digital zoom 」.