Problem 20 with non full frame cameras on full frame lenses

I don't know how your so-called virtual reality is, if it is not a problem with the lens mechanics, which causes the picture to be blurred, then if not, it is that you have too high optical requirements for the lens of the factory.

Maybe your so-called void, is not very sharp, the level of detail is not good, as far as I know, the highest imaging aperture of the head is in, the large aperture usable law is not high, this Sigma is not as good as Tamron, this has nothing to do with whether it is full or not.

Sigma's new lens.

Advantages: good backlight, anti-violet, strong ghosting, which I estimate is related to the improvement of his coating process.

Disadvantages: the availability of large aperture is not high, the detail color is not as good as the original, the sharpness is average, the machinery is poor, and the lens technology does not meet the aesthetic concept of the Chinese.

The above is purely personal opinion.

This has nothing to do with non-full-frame cameras on full-frame lenses!

It's best to have a picture taken to judge, because I don't understand the degree of fiction you said, whether it's in focus or not, it's still out of focus.

What if you can't focus even manually? If so, it's definitely a lens problem!

If it is seriously out of focus, it should also be sent for repair.

If it's not a technical problem, it's a lens problem, and there's no such thing as a full vs. non-full frame problem.

It doesn't matter if it's a full-frame shot.

It's best to take a 100% screenshot to see.

Is manual focus also virtual?

I think it's likely to be a lens problem, take it to a dealer to change, and try more lenses from the side factory.

You should be out of focus, ......It doesn't matter much whether it's full or not. Try manual focus to see.

The lens is broken, the focus is inaccurate, let's fix it. It has nothing to do with the full width.

What about the effective focusing distance? It's too close.

There is no significant impact, and the specific analysis is as follows:

There is no problem at all, and the full-frame lens has a large image circle, and the biggest advantage of installing it on an 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, and the image quality is very good.

For example, the Canon 17-40 red-circle lens has poor image quality at the upper edge of full-frame, but when mounted on an APS-C format camera, the image quality is really red-circled quality, and there is also Nikon's -85 lens.

Generally, there are four main types of sensor sizes of consumer digital cameras on the market: 2 3 inches, 1 inch, 1 inch, and 1 inch. Of course, in terms of selection, the larger the CCD CMOS size, the larger the photosensitive area, and the better the imaging effect.

Note: The angle of view of the telephoto lens is relatively narrow, so you can focus on the subject or portrait, so you can avoid unnecessary factors and make the subject of the photo more concentrated.

Sometimes telephoto lenses are often used to shoot landscapes, in addition to narrowing the angle of view, it can also shorten the spatial distance between the near and far shots, creating a strong sense of compression, making the feeling different.

To divide the camera brand.

To put it simply, the Canon has a huge non-full-frame vignetting and some direct top reflectors. If you don't get it right, you will ruin the camera, and it is best not to try it. Nikon's full-frame is fully usable because it automatically cuts through the surface when the DX head is attached, but with some pixel loss.

Sony's can be connected, but the vignetting angle is large and has no practical value.

Most of the same mounts can be connected (except for Canon), but because the image field of each lens is different, the practical value of connecting it is also different. In terms of dealing with the non-full-width head, it should be said that Nikon, which originally made up its mind to take the APS path, was the most attentive.

There are two scenarios.

Like Canon's lens group, if the original factory, the APS format lens can't be fitted with the full body at all, so it definitely can't be used.

But there are many sub-factory lenses, such as Tokina 12-24, although it is only an APS format lens, but most of them can be mounted with a full-frame body, in this case, there is no problem with use, but limited to the image field problem, there will generally be a circle that is black, because of APS"Congenital deficiencies"And can't cover the whole picture field and caused, this ** can still be used after cropping, but the composition inside is no longer what you shot at the time.

Of course, some APS format lenses, because the image field itself is still relatively sufficient, that circle of black appears very rarely, and even there are no cases, but it is generally rare to use APS lenses to match the full body for a long time, because the defects are too obvious, and the beauty is not the same thing after cropping.

Other brands of lenses are similar, the premise is that they can be installed, even if the lens contacts cannot be used, and the rest can be installed, most of them will be insufficient, but they can still be used, it's as simple as that.

It can be used on full-frame cameras, however, the frame will be cropped.

1. It can be used, but black circles will appear on the edges of full mode, and the size of the black circles varies from lens to lens.

2. Some cameras that support cropping mode, such as D3 or D700, will cause the pixel to be reduced.

3. Some partial lenses can alleviate the situation of black circles or vignetting by reducing the aperture.

Canon's lenses or lenses made for Canon snaps can be used on all Canon SLR cameras, such as the non-full-frame 500D 60D and full-frame Mark II

Canon snap-on lenses cannot be used on Nikon machines, either full-frame versus full-frame.

First of all, the mount must be compatible, and there are some features that may not be possible. However, it can be used, and the partial frame is just a screenshot of the middle part of the picture, which is equivalent to "longer focal length", and the problem of corner image degradation can also be partially eliminated.

Doing it yourself is the king.

The biggest difference is the size of the lens circle.

1. First of all, we need to clarify what a full-frame camera is, and a full-frame camera refers to a camera with the same size as the image sensor of a DSLR and the same size as a traditional 135 film.

2. As for lenses, non-full-frame lenses cannot be used on full-frame machines. However, full-frame lenses can be used with non-full-frame cameras.

3. Distinguish whether a lens is a full-frame lens from the lens model, Canon EF series is a full-frame lens, EF-S is a non-full-frame lens, Nikon DX is a non-full-frame lens, without DX is a full-frame lens, Sigma DG is a full-frame lens, and DC is a non-full-frame lens.

4. Full-frame lenses used in non-full-frame lenses need to be multiplied by the conversion factor, Canon's conversion factor is, Nikon is. That is, a full-frame lens with a focal length of 18 will become after multiplying the coefficient.

Whether the lens supports full-frame means that the photosensitive area of the lens is 36 24mm size. If the lens does not have a sensitive area of this specification, full-frame cameras are not supported. If this sensitive area is supported, full-frame cameras are supported.

The lens has two fingers in film and television, one refers to the optical components used by the movie camera and projector to generate the image, and the other refers to a continuous picture shot from the start to the shutdown, or the clip between two editing points, which is also called a lens. One finger and two fingers are two completely different concepts, and in order to distinguish the difference between the two, Lusina often refers to one to the optical lens and the other to the lens picture. According to the origin of the lens, it is mainly classified as Japanese disassembly lenses and German lenses.

The Japanese lens mainly has a better color reproduction, and the German lens has a strong sense of hierarchy. Chinese lenses in the market are also gradually occupying a certain market, mainly because they are relatively cheap.