# How do you compare zoom lenses?

## How do you compare zoom lenses?

To determine the overall zoom ratio of the lens, simply divide the longest focal length by the shortest. So, for example, the Sigma 18-35mm F1. 8 DC HSM and the 8-16mm F3. 5-4.5 are both examples of 2x zoom lenses: 35 divided by 16 equals 1.95, and 16 divided by 8 equals 2.

## What does 40x zoom mean?

Its 40x optical lens means it can capture from an equivalent 24mm wide-angle (wide enough for shots of groups, say, or landscapes), through to a massive 960mm equivalent (long enough to pick out far-away subjects and make them appear close-up within the frame).

**What is the disadvantage of zoom lens?**

Zoom lenses do have some disadvantages compared to prime lenses that you should take into consideration. A zoom lens is usually not as sharp as prime lenses. Another is that a zoom lens is slower. Because the maximum aperture of a zoom lens is narrower, it lets less light pass into the camera.

### What is 25x zoom?

A 25x zoom simply means the longest focal length is 25 times the shortest focal length. So a 24-600 means that 600/24=25 times. The 18-400 is a 22x focal length, but the effective focal length is 27-600mm on the Nikon camera.

### What’s the difference between Prime and zoom lenses?

The longer the focal length, the narrower the angle of view and the higher the magnification. The shorter the focal length, the wider the angle of view and the lower the magnification. There are two types of lenses-prime and zoom.

**What are the different types of camera lenses?**

There are two types of lenses-prime and zoom. Prime lenses have a fixed focal length and zoom lenses have variable focal lengths.

## How is the length of a lens measured?

It is not a measurement of the actual length of a lens, but a calculation of an optical distance from the point where light rays converge to form a sharp image of an object to the digital sensor or 35mm film at the focal plane in the camera.

## What is the focal length of an FX lens?

FX format approx. 300 ā 600mm / DX format approx. 200 ā 600mm. These lenses provide a good range for wildlife and sports photography where the photographer is limited as to how close they can get to the subject.