The focal length of the telephoto lens, how much is the focal length of the telephoto lens in mm

Telephoto lens: A photographic lens with a long focal length.

Telephoto lens. Focal length: 200mm or more: A focal length of more than 200mm is a telephoto lens, which is often used to shoot birds, sports, forest landscapes and other subjects. Long focal length lenses.

Refers to a photographic lens that is longer than the focal length of a standard lens. Long focal length lenses are divided into two categories: ordinary telephoto lenses and super telephoto lenses. The focal length of a normal telephoto lens is close to that of a standard lens, while the focal length of a super-telephoto lens is much larger than that of a standard lens.

Take the example of a 135 camera with a lens focal length.

Photographic lenses ranging from 85 mm to 300 mm are ordinary telephoto lenses, and super-telephoto lenses are above 300 mm. A standard lens with a 50-degree angle of view. The focal length is long, the source of the mountain and the diagonal of the frame being taken.

Photographic lenses of approximately equal length. The angle of view is generally 45° 50°. The 35 mm lens is a 40-60 mm focal length lens, the 6*6 cm focal length is a 75-80 mm focal length lens, and the 4*5 inch is 120-150 mm.

A standard lens is usually a photographic lens with a focal length between 40 and 55 mm, and the perspective of the scene represented by the standard lens is relatively close to the visual vision. It is the most basic photographic lens of all.

You can photograph objects that are thousands of meters away from you.

The 8mm ultra-wide angle of view reaches 180 degrees; The focal length of 50mm is closest to the angle of view of the human performance, and the 50 prime is the standard lens; The angle of view of 300mm is only 8 degrees.

Lens focal length classification.

Depending on the focal length, we divide lenses into wide-angle lenses, standard lenses, and telephoto lenses.

The wide-angle lens has a focal length of less than 35mm, which is suitable for shooting landscapes;

The focal length of the standard lens is 35mm, 50mm, 85mm, etc., which is suitable for shooting people;

The focal length of the telephoto lens is greater than 135mm, making it suitable for long-distance shooting such as shooting wild animals.

At present, the common telephoto zoom lenses are: 70-200mm, 70-300mm, 100-400mm. Sigma has a 300-800mm ultra-long zoom lens.

The current longest prime lens with the Canon was introduced in 1993. A long focal length lens refers to a photographic lens that is longer than the focal length of a standard lens.

A macro lens is a special lens used for macro photography, mainly used to photograph very small objects, such as flowers and insects. It is difficult to alternate close-up photography and normal photography by attaching close-up attachments to general photography lenses.

The macro photography lens is different, its close-up photography does not rely on other close-up accessories, all close-up operations are carried out on the lens itself, it can focus continuously between close-up and infinity, so that it can quickly adjust from close-up to normal photography, which provides convenience for photographers to alternate close-up photography and ordinary photography.

There are generally two types of macro photography lenses. One macro lens adopts a structure with a retractable lens barrel built into the side, and the other adopts a structure that replaces the front and rear positions of the optical lens group in the lens.

A macro lens is a lens that is capable of 1:1 shooting (** is the same size as the subject), so a long focal length lens with a macro shooting function is a telephoto macro lens. It has the advantage of being able to take macro photography from a long distance, so it does not disturb small creatures such as insects.

Canon, Sigma, Tamron, etc., all have their own telephoto macro prime lenses.

It can be magnified many times and used to see very distant or very subtle things.

A macro lens for long-distance shooting.

The focal length is large, you can see far away, and you can see clearly.

The super telephoto lens can shoot a full frame of the moon, if it is 800mm, it can shoot a water cup 10m away into a full frame, if you want to say how far you can shoot, the air is clean 10 kilometers is no problem.

A 50-500mm lens is obviously 10 times larger than 50mm at 500mm: then it can be understood that for example, an object at a distance of 10 meters is pulled closer to 1 meter at the 500mm end of the lens. And so on.

The maximum distance that a DSLR camera can shoot with a telephoto lens is related to the focal length value of the lens.

Sigma has a 1200mm lens, only 250,000, you can try it.