What does the number of the front lens of the DSLR camera and the number of the lens of the DSLR cam

18-55mm means that the focal length is 18 to 55 mm.

You should still have the words in this shot.

This means that the maximum aperture at the 18mm end (wide-angle end) is 1

The maximum aperture at 55mm (telephoto) is 1

As for the considerable zoom, this one doesn't make sense, not that the larger the zoom factor, the better, nor that the bigger the telephoto.

For example, for a 55-200 lens, the zoom factor is 200 divided by 55 about = 4, which is close to 4x zoom.

If it's an 18-200 lens, it's a little more than 10x zoom.

But the focal length of their telefocus is the same.

It is recommended to use 18-55 lenses + 55-200 lenses.

Novices use this transition (**not expensive).

I'm also a newbie, but I'm using a Canon 500D, and I'm looking to buy a 55-250 lens.

It is the focal length of the lens, which represents the width of the lens's field of view.

The higher the number, the wider the lens framing.

The lower the number, the narrower the lens framing, i.e., bringing distant objects closer.

18-55 means that the widest end of this lens is 18mm, and the narrowest end is 55mm.

Since it is a D5000, it is an APS machine, so you have to multiply one, that is.

What is the concept? The field of view of the 50mm lens is about the same as what can be seen clearly in front of the eyes of the human eye.

How many times zoom? Just compare the two numbers of focal length. 55 18 is about 3 times. Generally speaking, the smaller the multiple, the better the image quality.

The focal length of the lens is 18-55mm, and the Nikon is about 27-80mm equivalent to the original 35mm film camera, which is equivalent to 3 times the light change; Nikon D5000 with a head, if it is not expensive, with a fixed focus of about 700 pieces.

There is no set to buy 5000

Either buy D3000 or D300 It is not a good choice to pick a decent machine.

18--55mm is a wide-angle zoom lens.

Nikon D5000 Of course, if you have a Nikon lens or less, you have a wide-angle lens below 55mm, so you should have a zoom lens from mid-focus to telephoto 55-200mm.

Refers to its focal length, in different specifications of the camera, the focal length of the same lens will be different, for example, in the APD-C specification SLR and the full-frame specification SLR focal length field is different, the full-frame 18-55 to APS-C becomes about 35-70, the 18-55 you are talking about is the 18mm wide-angle end, 55mm is generally the standard vision, 18-55 is probably the optical zoom, if you want to play portrait photography I recommend you buy a 50mm fixed focus, because the aperture is relatively large, You can get a good depth of field, just more than 700 pieces, if landscape photography is generally a pullover, because wide-angle heads are more expensive.

The number of a DSLR camera lens represents the focal length of the lens.

The "AF-S NIKKOR 18-55mm1: ED" model is used as an example

AF-S: An autofocus lens suitable for DSLR cameras with an AF-S size sensor. (Represents a lens ultrasonic focusing motor that enables quieter and faster focusing).

nikkor: brand name.

18-55mm: The lens is a zoom lens, and the focal length of the lens is equivalent to that of a 35mm camera, and it is 18mm and 55mm.

35mm camera: The reason why it is called a 35mm camera is because the camera uses a 35mm width motion picture film. (The size of 35mm film is 36 x 24mm).

Later, this kind of motion picture film was specially packed in the cassette **, which was called 135 film, so the 35mm camera was also called the 135 camera.

1:: The maximum aperture of this lens is 1:: that is, the maximum aperture at the 18mm focal length is and the maximum aperture at the 55mm focal length is.

G: The lens motor drives the focus, and there is no manual adjustment of the aperture ring.

ED: There are ED low dispersion lenses in the lens group.

The first is a wide-angle lens. A wide-angle lens in this sense refers to a lens with a focal length of less than 35mm, such as a 28mm, 24mm, or even 16mm lens. Generally speaking, lenses under 24mm are called ultra-wide-angle lenses.

The focal length of the lens has to be multiplied by or, so for this type of SLR, 16mm can be considered an ultra-wide-angle lens.

The second type is the standard lens. Generally speaking, the focal length of the lens is 50mm or the angle of view of the lens is closest to the human eye, but only because of this, it is difficult to use the header well, because it is not like ultra-wide angle or macro lenses, which can shoot images that cannot be perceived by the human eye. The 85mm lens is generally a portrait lens.

The third type is a medium telephoto lens, which is usually 100mm or 135mm. Among them, the 100mm lens is generally a macro lens, and the 135mm lens is also a portrait lens, but it focuses on the bust portrait, while the 85mm lens focuses more on the full-body portrait.

To give you a**, build.

I'd like you to take a look.

The outer ring of the lens is usually marked with information such as focal length, aperture, filter size, etc. The information on the sign is based on Nikon as an example:

AF-S is an autofocus lens with a SWM silent wave motor;

VR is Nikon's image stabilization feature that identifies the meaning of the Zoom zoom lens;

ED said that the lens uses a low-dispersion lens, and Nikkor is a special trademark for Nikon's lenses;

70-300mm indicates the zoom range, moving the focal length from 70mm to 300mm;

Arbitrarily adjustable f corresponds to the maximum aperture value of the 70mm end and the 300mm end brother bureau g is the lens type, which means that there is no manual; The aperture ring if indicates inner focusing, that is, there is no change in the length of the lens during the process of focusing, note that it is focusing, not zooming.

The numbers on the lens represent the parameter values of the lens.

Numbers like 18, 24, 35, 50 on the lens mean focal length.

The shorter the focal length, the wider the shooting range, and the more suitable it is for shooting landscapes.

The longer the focal length and the farther the distance, the more suitable it is for shooting special subjects, such as birds.

VR stands for image stabilization, and F starts with aperture, taking Nikon 70-300mm F VR as an example, where 70-300 indicates the focal length, which is the aperture value.

Nikon began producing lenses under the Nikkor name in 1933 and has sold more than 25 million lenses worldwide.

Nikon lenses have always been known for their high definition and contrast, and are used for shooting purposes such as journalism, architecture, industry, medicine, remakes, and plate making. What is especially rare is that the quality is stable and there have never been big ups and downs; It has always been among the best in countless tests and evaluations, and has maintained a high-quality image, so it has won the high trust of the majority of professionals and photography enthusiasts.

18-55mm and 18-135mm must be a zoom lens if there are two sets of focal length values marked on the same lens, and vice versa.

ii Identification of the second generation lens.

is the identification of the stabilization function.

18-55 lens: The focal length of the lens is a standard zoom lens from 18 to 55mm, this head has a practical focal length, but the image quality is average.

18-55 IS II: This is the second generation (II) 18-55 mm lens with stabilization (IS).

18-135 is: The focal length of the lens is a medium telephoto zoom lens with image stabilization function from 18 to 135mm, the focal length is very practical, but it is a lens with a large zoom ratio, and the image quality is average.

IS second-generation image stabilization, zoom, J focal length 18mm-55mm, the fixed value is the fixed focus, depending on how you use it, how to adjust it.

It's okay for newcomers to use this to practice, but they want to upgrade 、、、 burn money in the future. Fixed focus, telephoto, wide angle, many 、、、

18-55 lens zoom head with focal lengths from 18 mm to 55 mm.

18-55 IS II Zoom head with focal lengths from 18 mm to 55 mm with 2nd generation stabilization.

The 18-135 is a zoom head with focal lengths from 18 mm to 135 mm with image stabilization system.