Focal length signifies the distance from the optical center of the lens to the image sensor of your camera and is measured in millimeters. The lens' focal length determines how large the object will appear in the frame and how wide the lens' angle of view will be.

1. FOCAL LENGTH
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2. Hello Leaders!
This girl's name is Mary. She'll help us study the topic of "focal length".
First and foremost, focal length is one of the most important lens properties. It signifies the
distance from the optical center of the lens to the image sensor of your camera and is
measured in millimeters.
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However, the mechanics aren't very important. What’s important is that through a lens
with a small focal length (15 mm), you'll see a large area and many objects: Mary, the
road, the sky, and part of the steppe around it:
f = 15 mm, distance to the model: 20 m

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Through the 800-mm lens, however, only Mary's eye will enter the frame.
f = 800 mm, distance to the model: 20 m

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In other words, the lens' focal length determines how large the object will appear in the frame and how wide the lens' angle
of view will be.
The relationship is simple: the smaller the focal length, the larger the area which enters the frame. And the other way
around: the bigger the focal length, the larger the objects will appear.

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7. FISH-EYE
8-15 mm
A lens with a very wide viewing angle (~180°) which provides a prominent "fish-eye" effect (a significantly bent image).
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9. WIDE-ANGLE LENS
14-35 mm
Wide-angle lenses (short focal length lenses) are usually used for taking indoor, landscape or event coverage pictures.
With their wide field of view (from 52° to 82°), these camera lenses are capable of "fitting" a considerably bigger area in the picture than the majority of other
lenses.
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13. "NORMAL" CAMERA LENS
35-60 mm
The focal length of these lenses is approximately equal to the frame's diagonal.
The perspective of a picture taken through such a lens is the closest to the one seen with a human eye.
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15. PORTRAIT LENS
60-135 mm
The portrait lens has a rather narrow field of view and is meant for taking close-up pictures (specifically portraits).
These lenses have good luminosity, "soft" imaging, and the ability to make the object of the picture stand out against the strongly blurred background.
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18. TELEPHOTO LENS
135-800 mm
The telephoto lens is used for taking pictures of distant objects.
Popularly known as "tele-lens", this type of lens has a very narrow field of view (up to 1°) which makes it possible to get a very large scale image (for example,
close-ups of football players tangled up at the other end of the field).
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