What are the parameters of the common Longteng lens?

Lead: Among the SLR lenses that primary photographers contact more, Canon and Nikon account for the majority, and other well-known brands such as Pentax, Sigma, Tokina and Tamron also have their own worlds.

What are the parameters of common Longteng lenses? The following will systematically introduce the logo meaning of Longteng brand lenses:

AD: abnormal dispersion. Longteng lens with this logo has the function of eliminating dispersion. Mainly used for medium telephoto lenses and some wide-angle zoom lenses.

ASL: aspheric lens.

BBAR: Broadband antireflection multilayer film. This is Longteng's unique lens coating technology.

Di: digital lens, English digital integration. This is a digital camera lens specially prepared by Longteng for DSLR.

LD: Low dispersion lens.

M (short for meter) O.D.: Nearest focal length, which is the minimum object distance in English. Its specific value represents the closest focal length of the Longteng lens.

SP: Super Performance lens, English full name super performance. Really? SP？ The logo of the lens shows that this is a high-performance Longteng large-aperture lens.

XR: high refractive index glass. The size of Longteng lens using this technology is very small.

For example: Tenglong 17-35mm F4.5-5.6 DIII lens.

We interpret the complete parameters of this lens as follows: Longteng autofocus lens; Focus range17-35mm; The maximum aperture coefficient is 4.5-5.6; Special for digital SLR cameras; The second generation lens.

Usually it will indicate whether the lens is AF mount or EF mount, and usually it will contain some lens category identification;

1, focal length parameter: indicates the focal length range of the lens in mm;

2. Aperture parameter: indicates the maximum aperture coefficient of the lens, and some lenses also indicate the minimum aperture coefficient of the lens;

3. Features: Indicates the feature technology adopted by the lens, etc. This is also the content to be explained later.

In addition, the version number is also one of the common logo text contents, indicating which generation of products the lens belongs to in the same specification lens.

In addition, we can also see the same information words on the lens logos of different brands, such as:

CF Micro: Quanhong, whose English name is continue focus micro. This kind of lens can directly focus on the macro shooting state at all focal lengths.

Macro: Macro function. It means that the lens has macro shooting ability, usually reaching the magnification effect of 1:2 or above.

Fisheye: Fisheye lens, which realizes special fisheye distortion effect.

Infra Red, English full name infra red. In infrared photography, the focus baseline mark is engraved on the lens barrel.

SC/MC: single layer/multilayer coating.

Telephoto lens: telephoto lens.

Zoom: Zoom lens.

And those lenses that are not often used by junior filmmakers and related to the German optical industry, such as Leica and Zeiss, will be added to the front? Distagon？ Something like that. ?

Finally, once again remind everyone that the logo characters of these lenses are generally printed or etched on the pressure ring at the front end of the lens, and there are also practices of printing corresponding characters on the mirror body. Some special shots will be in? f-？ Under the logo of the aperture, further identification? T-？ Aperture identification, such as Minolta STF 135/2.8[T4.5]. In addition, those lenses related to the German optical industry that are not often used by junior filmmakers, such as Leica and Zeiss, will also be added to the front. Distagon？ Something like that. ?