What is a P type lens and what is a P Iris lens

P-type lens: Built-in CPU lens.

The built-in focus motor is a "one-size-fits-all" strategy, but it doesn't work well with huge telescopic auto lenses, which makes it impossible to use telescopic lenses efficiently with Nikon's new camera. In 1998, Nikon partially solved this problem by releasing a built-in CPU manual focus telephoto lens (P) to meet the advanced auto** function of the AF body. Although P-type lenses look the same as AI-S lenses, these lenses have the electronics and most of the performance of AF lenses.

There are currently only 3 P-type lenses: the 500 4 IF-ED, the 1200-1700 IF-ED, and the 45.

P-type lens 1) Automatically position the lens, the pupil focus has been adjusted, and it is necessary to check whether the clarity from the maximum magnification to the minimum magnification is consistent and clear.

2) Check the coaxiality, that is, the maximum magnification to the minimum magnification are taken in the same position, and cannot be offset or the offset is too large, which is regarded as a defective product, and the lens must be replaced.

3) The optical magnification is a total of nine magnifications between magnification and magnification.

4) The sharpness is judged according to the correction block and the image reflection of the actual object.

p: precision.Precise aperture. The lens automatically adjusts the aperture size according to the amount of light entering the lens.

First, the focusing method is different.

1. AF-P: According to the state of the subject (still or motion), the camera can automatically select the auto-focus mode or continuous follow-up autofocus mode for single shooting, and can automatically start the tracking focus mode to track the focus of high-speed moving subjects.

2. AF-S: refers to a single autofocus used to shoot still objects, half press the shutter camera to focus once, the focus is locked, press the shutter to shoot, that is, a focus mode.

Second, the applicability is different.

1. AF-P: Regardless of whether the shutter is pressed halfway or not, the camera always performs the focusing operation. It can be seen that this mode is very suitable for shooting sports scenes and subjects.

2. AF-S: used for stationary subjects. Focus locks when the shutter release button is pressed halfway. The shutter can only be released when the camera is capable of focusing.

Third, the motor is different.

1. AF-P: The lens does not have a motor.

2. AF-S: AF-S lens with ultrasonic motor.

The biggest difference between the two lenses is that the AF type is driven by a fuselage motor, while the AF-S model is the lens version with its own SWM ultrasonic motor to adjust the focus.

In other words, with the Nikon AF-S, regardless of whether the camera has a built-in focusing motor or not, the lens can complete the work of focusing shooting independently, while the AF lens is not, and if the camera does not have a focusing motor, you can only use manual focusing. This is also the main difference between Nikon AF lenses and Nikon AF-S lenses, but the ** of Nikon AF-S lenses is more expensive, mainly because of the addition of this focusing module.

AF-P is a stepper motor autofocus, and AF-S is an ultrasonic motor autofocus.

AF-P is **.

There are several lenses, 6p is 6 lenses, and 7p is 7 lenses. Lenses were added to improve lens distortion and the difference in edge and center resolution.

Generally 5 million is around 4 tablets. I'm just doing mobile phone lens design, hehe.!

Your question is too simplistic, but I'm guessing p refers to the unit of number of lenses in the lens.

It refers to how many layers of glass there are in the lens, and generally the more images the better, but this parameter is generally difficult to check.

A-head, early K-mount,,, 1960s

C-head, A-head with multi-layer coating ,,,1960s

CU head, the first auto-iris 1960s

K-head, the first to use ED ultra-low scatter lenses and IF in-focus technology in the 1970s

AI head, Nikon F mount foundation laid, introduction of metering linkage technology 1970s

The AI-S head, with improved AI heads, continues to inject technology for shutter priority and programming** 1980s

Type E head, lightweight, inexpensive lens using engineering plastics, accelerating the boom of the consumer market. 1980s

The F3-AF was the first to introduce the DX autofocus unit, and the world has since entered the era of autofocus. 1980s

The AF-N head, an improvement on the early poor quality AF head, introduced aspheric mirrors for the first time. Such lenses are still in circulation today. 1985s

The AF-P head has a built-in focusing motor in the body, and the compatibility of the AF lens has been greatly improved. 1990s

The AF-D head, with integrated electronic distance measurement function, brings a great improvement to the flash photography effect. For the first time, a glass-ground aspheric mirror was used. D-head, an improved version of the data link for integrated drive motor and 3D matrix metering, 3D multi-sensing balance filling. 1990s

The AF-VR head introduced VR shock absorption technology for the first time, and has since entered the era of lens stabilization. 2000s

Today. Plastic AF lenses, AF-D lenses of the E series, aimed at amateur photographers. To this day, there is also a large circulation. 1996

iX lenses, inexpensive and compact specialized lenses developed for APS folding format cameras. 1996

The AF-i lens is an improved version of the AF-D head, which integrates the Intergrated-I silent high-speed motor, which is a powerful tool for sports capture. 1992

The AF-S lens, the successor of the AF-I series, integrates an S ultrasonic motor for better focusing performance. 1996

Type G lens, due to the development of the economy, there are many half-enthusiasts, they do not have absolute professional knowledge, and they are eager to photograph, so the G-type head that cancels the aperture adjustment ring appears, and the performance of the G-type lens has a G suffix at the end of the number. 2000

No. It's a way to autofocus.

AFS is a one-shot focus, that is, the shutter is pressed halfway, and the focus is fixed once and then it does not move.

AFC is continuous focusing, pressing the shutter halfway, and the focus will be restarted whenever the camera position changes slightly.

AFP should be unique to your camera and be some kind of program that is automatically selected.

Autofocus lens.

In terms of optical structure, there is no difference between an AF lens and a manual focusing lens, but in terms of its mechanical structure, the two are different. The basic point of the design of the AF lens is the transmission path of the autofocus power.

According to the location of the power source, the AF lenses currently on the market are divided into two categories: one is the fuselage driven type, and there is no drive motor in the lens, such as Minolta, Nikon and Pentax lenses; The other type is lens-driven, with an AF motor in the lens, such as Canon's EF series lenses.

Differences from manual focus lenses.

Another difference between AF lenses and manual focus lenses is that AF lenses have electronic contacts that are used to exchange various parameters with the body. There is a ROM chip in the lens that stores parameters such as the focal length of the lens, the maximum and minimum aperture, and the minimum focusing distance, and the camera sets the corresponding working mode according to these parameters. For example, in the program auto mode, the corresponding program line is selected according to the focal length of the lens.

It's AF-S and AF-P, there is no AP-P logo, AFXX logo represents the lens focusing machine disadvantages, AF-P logo is a lens that uses a new motor, a new series that has just come out in the past two years, it is quieter to rent and use, and it is suitable for use when shooting. The DX logo means that this lens is an APS-C format (Nikon calls this specification DX) a dedicated lens, and is not recommended for full-frame (MamboNikon calls it FX) machines.