Focal length conversion issues for full frame and half frame camera lenses. 10

I was skeptical at first, and then I asked, how far is it? Or not far?

Personal Answer Reasoning 1

A full-frame sensor, for example, is the number 5

Half-format sensors, for example, are the number 3

Then use the same lens 50 set.

The full-frame view is a 50mm distance field of view.

The half-frame view is an 85mm distance field of view.

Here's the problem. Does that mean that a full-frame 85 and a half-frame 50 are a focal length field of view?

So from this point of view, which is more expensive, a 50 head or an 85 head? It's definitely 85.

In this way, the half-frame camera is more powerful, saving money and being like a full-frame camera.

Wrong, wrong: the field of view is not the distance, the full-frame lens is 50mm, and what you see is a 50mm field of view, for example, the number 5.

With a 50 lens in half frame, you can see an 85mm field of view, let's say the number 8.

Solution: Full-frame 5 is 5, and it is 5 up and down, left and right.

The half-frame is 8, and the top, bottom, left and right are 8.

They see the same distance. The difference is that they don't see the same range. One is the range of the eyes open, and the other is the range of the eyes half-squinted.

Two people stand on a horizontal line, 10 meters away from the camera, and 10 meters apart from each other. In full frame, you can see two people appearing in the frame at the same time. Only one person can be seen in half frame. You think you're looking far ahead. In fact, it is narrow.

The so-called equal focal length and equivalent focal length should be that the image capacity of the imaging with a full 85 lens is the same as that of the image imaging with a half-frame 50 lens.

Cropping: Full shot of 5 **, only forward to half of the 8 position, the image quality is almost the same, the distance is almost the same.

This emperor is my personal attraction.

Half-frame 120 focal length is almost full-frame.

200, of course, half a frame this far away.

It's not the same as farther, and the half-frame is a little farther away.

First, the reference is different.

1. Full-frame: refers to the specification with a photosensitive area of 36 to 24 mm. This specification is used to describe the image circle index of the lens and the size of the sensor.

2. Half-frame: also known as APS format, refers to the imaging area based on the "APS system".

Second, the characteristics are different.

1. Full-frame blue core: Kodak's standard KS-1870 uses 35mm film, and maintains the 36 24mm specification to 135 format; Subsequently, Leica i-type cameras from Leica AG made this standard a common practice.

Third, the classification is different.

2. Half-frame: APS film has three sizes, C, H, and type are full frame (the aspect ratio is 16:9, and the C type is to block one end at the left and right ends of the full frame, so that the aspect ratio is 3:

2, the P type is a full width of the upper and lower sides of the block, so that the aspect ratio of the picture is 3:1.

The focal length remains the same, and the focal length is the distance from the optical center of the lens to the sensor, which has little to do with the body. For example, if your lens says that the focal length is 35mm, then its focal length will always be 35mm, no matter what kind of body it is mounted on, the focal length is 35mm. However, the sensor size of a half-frame camera is not the same as that of a full-frame camera, so the actual range of the image captured when the same lens is used in the same position with different bodies, is also very different.

Therefore, there is a saying about the cropping factor, which is to simply convert the image range between different format camera systems. The cropping factor is 1 for a full-frame system, and a camera system with a smaller sensor size than full-frame is greater than 1, for example, most of the half-frame cameras are, and Canon half-frame is the same, and the camera system with a larger sensor size than the full-frame is less than 1, such as 4433 medium format. Multiply the focal length of the lens by the cropping factor corresponding to the camera body to obtain an equivalent focal length, and by comparing the equivalent focal length, you can roughly determine the size of the picture range.

The image field is also unchanged, the image field is a clear image of a circle presented on the focal plane after the lens has a converging effect on the light, and the size of the image area is the size of the image field. Therefore, the image field size of different lenses is also different, but the image field of most half-frame lenses cannot well cover the full-frame sensor (the part of the picture outside the image field is black), because the sensor size gap between these two specifications is very large, and most of the manufacturers' half-frame products are entry products or transition products, the number of lenses itself is small, and the product positioning and design specifications are generally not high, plus many half-frame lenses themselves are in pursuit of portability, It is impossible to design the image field to be very large. In short, there are very few half-frame lenses that can cover the full-frame sensor well with an image field, and there are very few that actually work well.

In short, when a half-frame lens is mounted on a full-frame body, the focal length and image field do not change, but this usually does not make much practical sense, because the image field is often too small to complete the normal shooting work.

Nikon, Sony's half-width conversion coefficient is, Canon's half-width conversion factor is, Olympus and Panasonic conversion coefficient is 2, and converting to full-frame is to multiply the focal length of the half-frame lens by the conversion factor. For example, the Nikon 50mm is 75mm when converted to full width, the Canon 50mm is converted to 80mm when converted to full width, and the Olympus M43 is converted from 50mm to 100mm when converted to full width.

The meaning of conversion is the conversion of the angle of view, that is, the full-frame and half-frame are placed in the same shooting position, and what focal length lens can be used to obtain the same angle of view, such as Nikon half-frame shooting with a 50mm lens**.

If you shoot with a 50mm lens, the picture will be twice as wide as the half-width with the half-frame.

Full frame. When the lens is used on a half-frame body, the actual focal length does not change, and the actual aperture does not change.

A full-frame lens is used on a half-frame body, which produces an "equivalent focal length."

concept. The equivalent focal length of the lens will be lengthened or doubled accordingly. ......However, the physical focal length of the lens does not change.

Regardless of which body the lens is mounted on, the actual focal length does not change in any way. Correspondingly, the actual aperture does not change in any way......Focal length and aperture are the physical properties of this lens, and nothing will change unless the lens is modified.

In fact, the so-called "equivalent focal length" is nothing more than a narrower half-frame imaging field, which is equivalent to cutting a part (about 40% of the area) from the imaging field of the full-frame lens, so it is equivalent to a focal length elongation or doubling ......The imaging properties of the full-frame lens itself have not changed at all compared to the state it had when it was mounted on the full-frame body. Regardless of the focal length or aperture, it does not change.

aqui te amo。

Yes, we are talking about equivalence, the equivalent focal length will change, the 10mm angle of view of the full frame will become the 15mm angle of view, the aperture will also change, and the full-frame aperture will also become the equivalent aperture.

The full-frame lens is used in the half-frame body, and the actual focal length will change, so will the actual aperture change In fact, the focal length and aperture are still as big as before, but the angle of view is different. If you use the focus reduction and brightness enhancement adapter, it will have the effect of restoring the angle of view and increasing the aperture.

No, the amount of light per unit area is the same.

No, no matter how big the whole frame is, how big is half of it

The phase field is cropped.

The edge quality will not be visible.

Many people don't mention the concept of resolution, assuming that the resolution and small format of the full-frame camera are both 1:1, and the size ratio is 1:, then the pixel density is:

1. If a full-frame lens just feeds a full-frame resolution, then the resolution of a full-frame lens in a small format is = . That is, the image quality of a full-frame lens will be greatly reduced in a small format.

Summary. 1.Full-frame cameras use a half-frame format to extend the focal length;

2.The extended focal length factor is Canon's, for example, with a 50mm lens, it becomes 75m with a half-frame format (80mm for Canon), and so on.

3.Full-frame cameras use lossy pixels in the half-frame format;

4.The full-frame imaging effect is the same as that of the half-frame format and the post-cropping effect of full-frame imaging.

Can a full-frame camera be set to half frame to increase the focal length?

1.Full-frame cameras use a half-frame format to extend the focal length; 2.The extended focal length factor is Canon's, for example, with a 50mm lens, it becomes 75m with a half-frame format (80mm for Canon), and so on. 3.

Full-frame cameras use lossy pixels in the half-frame format; 4.The full-frame imaging effect is the same as that of the half-frame format and the post-cropping effect of full-frame imaging.

Thank you.

It's best not to install it like this.

One is that a half-frame lens may not necessarily fit in full-frame.

On cameras, for example, Canon cameras can't be installed, Nikon and Sony can.

Second, after attaching a half-frame lens to a full-frame camera, the camera will automatically recognize the information that destroys the lens, and then the camera will change to half-frame mode.

After attaching a half-frame lens to a full-frame camera, the half-frame lens does not have an effect, but it does have an effect on the camera, and a large circle outside the camera sensor will not be imaged, and the full-frame will become a half-frame manuscript format. Some half-frame lenses are fitted with full-frame cameras and have vignetting.

Advantages of full-frame cameras

Take the Canon EOS 400D (APS-C format) and an 18-55mm lens as an example, multiplied by the magnification, to show the equivalent focal length of the lens on the camera.

will become, but if it's a full-frame SLR.

With an 18-55mm lens, its focal length will remain the same.

Therefore, the advantages of full-frame are obvious, not only can the old lens be used to the fullest, but also because of the large area of the image sensor CCD CMOS, the more photons captured, the better the light sensitivity and signal-to-noise ratio. The higher.

No problem at all.

The biggest advantage of installing the APS-C format camera on the APS-C format camera for those entry-level full-frame lenses is that it can basically avoid the edge part of the lens with relatively poor imaging, and only use the ** part of the lens, which may have certain advantages in imaging.

Because full-frame cameras produce lenses with an image size larger than the photosensitive area of half-frame cameras, they can be used in half-frame cameras. However, at this time, the imaging of the peripheral part of the lens exceeds the edge of the image sensor, and the image sensor only obtains a smaller part of the center of the lens image, and the angle of view of the lens imaging becomes smaller; However, since the sensor size of the APS-C format camera is smaller than that of the full-frame camera, and the equivalent focal length is larger than that of the 135 camera, the actual focal length is only after the conversion of the focal length conversion factor. Generally speaking, the conversion factor of Canon cameras is that its full-frame 50mm prime lens is used in APS-C format cameras, which is smaller than the 35mm prime head of general APS-C format.

If it is a lens of the same type of mount, the full-frame lens can be used in the APS-C format, and it can be used in the mirrorless or 4 3 camera, and most of the time it needs to be turned into a blue adapter. Because the full-frame image field is large, when used in the APS-C format, only the surrounding areas will be lost, and the image will not be complete.

In addition, the full-frame mirror box is relatively large, and the APS-C format lens is relatively compact, so it is likely that the rear mirror group will conflict with the mirror.

Dear, hello, very high orange Yinxing for you to answer, how much does the 200 focal length become after the Sony camera full-frame switch half-frame or grind the format Answer: The standard focal length conversion coefficient of Sony half-frame camera is. The size of the image sensor coms of the Sony full-frame camera is 36*24mm, and the diagonal size is, while the size of the coms of the half-frame camera is about and the size of the diagonal, so the focal length conversion coefficient of the two cameras is divided by , which is approximately equal to.

Therefore, when the lens is used in a half-frame camera, the equivalent focal length is multiplied. For example, a 50-frame prime lens is equivalent to the 80mm focal length of a full-frame camera on a half-frame camera.