How to enlarge photography

Suggest adding a close-up to try. The information about the close-up is as follows: 1. Close-up shot and its principle introduction.

Close-up lens is an additional filter, which can be used for macro photography simply by screwing it into the filter thread of the lens. According to the structure, it is usually divided into single-chip structure and a group of two-piece achromatic structures, and according to the coating situation, it can be divided into uncoated, single-layer coated and multi-layer coated. Low-end close-up lenses on the market are mostly single-lens uncoated, and the price is about tens of yuan to 200 yuan, but the imaging quality of such close-up lenses is far from meeting the requirements of today's high-pixel digital cameras.

The serious chromatic aberration and blurred image caused by the single lens structure may eclipse an excellent macro work.

However, a set of two-piece achromatic close-ups will hardly affect the imaging of the main lens under a suitable aperture. At present, the only common achromatic close-range lens on the market is Canon 500D/250D series close-range lens, but its price is not only expensive, but also when used for lenses with long focal length, only clear images can be obtained at a smaller aperture, while only blurred images can be obtained at a larger aperture.

XPRO close-range lens also adopts a set of two achromatic multilayer coated lenses, and the structure is optimized. Even in the case of long focal length and large aperture, it can still obtain quite clear images, and at the same time, the green multilayer coating on the top of it presents a charming appearance and achieves high transmittance. XPRO close-range lens strives for perfection in workmanship, and is equipped with high-strength magnesium-aluminum alloy front and rear covers and exquisite special bags for free. Logo is carved by laser, which is exquisite and eternal.

Close-ups improve magnification by reducing the closest focus distance of the main lens. Monolithic structures and achromatic close-ups are both positive lenses. If they are installed in front of the lens, the optical path will change, resulting in a maximum focusing distance limit of the lens, which is equal to the focal length of the close-up lens in the distance from the close-up lens to the object, and beyond this limit, the lens cannot focus. The nearest focal length varies with the structure of the main lens. For example, the closest focal length of a 18-200mm lens and a 70-200mm lens using the same close-up lens may be different. The magnification of a close-up lens is determined by both the focal length of the close-up lens and the focal length of the lens. The shorter the focal length of the close-up lens, the higher the magnification, and the longer the focal length of the main lens, the higher the magnification. A wide-range zoom lens like 18-200 may achieve the highest magnification at the farthest focal length when using close-up lenses.

Second, the choice of close-ups

The choice of close-up lens should not only pursue high magnification, but also be considered comprehensively. First, the focal length and structure of the main lens. When the focal length of the main lens is long enough, it is suggested to choose a close-range lens with the focal length as long as possible, so as to obtain a high enough magnification and a far and wide focal range. For a large zoom lens (such as 18-200mm), it is recommended to choose a close-up lens with a short focal length, because the closest focal length of this kind of lens itself is relatively close, and a close-up lens with a high magnification is needed to significantly shorten the focal length and improve the magnification.

Secondly, the imaging quality of the main lens. If the imaging quality of the main lens is excellent, it is suggested to choose a close-range lens with a long focal length, which can not only obtain a high enough magnification, but also have a wide and far focusing range. For example, Canon/Nikon's 70-200/2.8 and other lenses with excellent imaging can use XPRO SUPER F500 close-up lens to appropriately reduce the aperture, and its 100% screenshot remains clear and delicate, which can meet the requirements without too high magnification.

Three. Frequently asked questions about close-ups

1. What are common macro devices? What are the characteristics?

Common macro equipment includes macro lens, close-up circle and close-up mirror.

As the saying goes, macro lens is not only good at macro photography, but also very suitable for portrait photography. It can reach the photographic magnification of 1: 1, usually a fixed-focus lens, and the imaging quality is almost impeccable.

The close-up adapter is installed between the lens and the fuselage, and there are no optical elements in the adapter. Although it does not affect the imaging of the main lens in theory, it will reduce the effective aperture, and it is cumbersome to disassemble and assemble, which is easy to accumulate dust. In addition, the connecting ring with electronic contacts is expensive, while the connecting ring without electronic contacts makes the main lens and fuselage lose all automatic functions. Close-range loop can only shoot near objects, but can't focus on far objects.

Close-up lens can be used only by screwing it into the thread at the front end of the lens like uv lens, which will not affect the automatic function of the main lens and the fuselage like ordinary filters. It takes only a few seconds to disassemble and assemble, and it is small and light, so you can only shoot objects within a certain distance with a close-up lens.

2. How does the imaging quality of close-range lens compare with that of macro lens?

If you choose a single close-up lens, the imaging will be very poor, and it can't be compared with the macro lens.

If you choose a set of two-piece achromatic close-range lens (such as Canon 500D close-range lens), the image will be greatly affected and blurred when the main lens uses a large aperture. After properly reducing the aperture, the definition will be obviously improved, even close to the macro lens.

If XPRO close-range lens is selected, when the main lens uses a large aperture, the impact on imaging is much smaller than that of ordinary achromatic close-range lens, and clearer images can still be obtained, especially for high-resolution lenses. After properly reducing the aperture, its definition is closer to that of macro lens.

3. Can I take a close-up shot in the distance?

The lens can't shoot a long-distance object after using a close-up, and the longest shooting distance (measured by the distance from the close-up to the object)

Equal to the focal length of the close-up.

4. Can I use close-ups for wide-angle lenses?

Close-up lens is not recommended for wide-angle lens with focal length less than 50 mm Because of the low resolution of wide-angle lens itself, even if close-up lens is used, the magnification is not obvious, and it is difficult to get a very clear image.

5. Is there a big difference between the close-ups of tens of dollars and hundreds of dollars?

At present, except for Canon 500D/250D, which is a two-piece achromatic structure, almost all other lenses are single-lens ordinary close-up lenses, and few people are coated. Even the multi-lens group close-ups sold by Kengo in Japan are just a few single-lens close-ups with different magnifications. The imaging of single-lens structure and a set of two-piece achromatic structure is very different, even not at the same level. Especially for telephoto lenses, the effect is even worse. Single-chip close-ups can only get blurred images with obvious chromatic aberration, while achromatic close-ups can get clear and basically achromatic images.

6. Are different achromatic close-up images the same? What are the advantages of XPRO close-range lens over other achromatic close-range lenses?

Even a group of two achromatic close-ups, the imaging is not necessarily the same. Most achromatic close-ups only have little effect on the main lens imaging under small aperture (for example, three steps smaller than the maximum aperture), while the image clarity is poor under large aperture (for example, close to the maximum aperture). The XPRO close-up lens is optimized in structure, and even if it is used in a large aperture, a clearer image can still be obtained. At the same time, the top green multilayer coating is adopted, which presents a reflective effect similar to that of an advanced telephoto lens. The work of the mirror ring is perfect, the surface is smooth as silk, and the inner side of the tail is designed as a step to avoid reflecting stray light. At the same time, the use of magnesium-aluminum alloy front and rear protective covers is unprecedented, which is integrated with the close-up mirror, simple, tough and exquisite, and the laser engraving text is perfectly presented in every detail. This is an attractive handicraft.

7. Can I use close-ups for macro shots?

After using the close-up, the macro lens can get a magnification of more than 1: 1, and the nearest focus distance will be shortened.

8. You already have a macro lens. Do you need high-end close-ups?

Achromatic close-ups well balance the imaging quality and portability. When going out for photography, you often carry a wide-angle zoom lens and a telephoto zoom lens. Macro lens is bulky, fixed focus, inconvenient to use, and difficult to bear the pain of changing lenses frequently. XPRO close-range lens hardly affects the imaging quality of the main lens, and when used in high-quality telephoto lens, its imaging quality can be comparable to that of macro lens. In addition, XPRO close-ups can also be used for macro lenses, and the ultra-high magnification exceeds 1: 1. XPRO close-range lens is very convenient to carry and use, and it will be an excellent solution for film friends who pay attention to imaging quality and like outdoor shooting.

9. Is it a significant weakness that the focus distance of close-up lens is farthest?

When using a close-up, there will be a limit of the farthest focus distance, which is equal to the focal length of the close-up (measured by the distance from the close-up to the object). Usually this distance is tens of centimeters, depending on the focal length of the close-up. This range is also commonly used for macro shooting with macro lens. Therefore, compared with macro lens, the limitation of the farthest focal length of close-range lens is not a significant weakness. Once you need telephoto, you can take off the close-up lens at any time, which is very convenient.

10. The higher the magnification of the close-up lens, the better?

Generally speaking, the magnification of close-ups is not as high as possible. The higher the magnification of close-up lens, the shorter the focal length, the closer the shooting distance and the narrower the focusing range. For a lens with short focal length (such as a large zoom lens like 18-200), it is necessary to use a close-up lens with higher magnification, which can significantly improve the magnification of the original lens. For lenses with long focal length (e.g., greater than 200mm) and long focal length (e.g., greater than 1m), it is suggested to choose a close-up lens with a slightly lower magnification to obtain a higher magnification and a wide focus range for easy operation. If you only need high magnification for special needs, you can choose a close-up shot with high magnification.

1 1. What is the best aperture range for a close-up lens?

The telephoto lens adopts a close-range lens with a common monolithic structure, and it is difficult to obtain satisfactory imaging quality under any aperture.

When using a smaller aperture (such as reducing the aperture by more than 3 levels), the general achromatic close-up lens hardly affects the imaging of the original lens, while when using a larger aperture, the image cannot be clearly obtained.

XPRO close-range lens has obvious advantages. Even if the main lens uses a large aperture and a long focal length, its focus sharpness is quite high, and there will be no blurring phenomenon. After properly reducing the aperture, it will be as sharp as a blade.

12. Do I have to use a tripod when using close-ups? How to get a clear image by hand?

Macro photography has a shallow depth of field. Generally speaking, it is recommended to use a tripod to get a clear image in low light. However, most people are used to holding hands when shooting outdoors, so it is necessary to increase the shutter speed. Macro photography often uses a smaller aperture to increase the depth of field, so it is necessary to use a flash or improve ISO to obtain normal exposure. If an internal flash is used, it is recommended to set the shutter to the highest synchronization speed and the ISO to the lowest. At this time, even if the focal length is greater than 200 mm, a clear image can be obtained. If the camera body or lens is equipped with anti-shake function, the shooting success rate will be greatly increased.

13. How to control the depth of field?

Depth of field is the clear range of an object. In macro photography, the depth of field is usually very shallow, about a few millimeters. The longer the focal length of the lens, the shallower the depth of field, the larger the aperture, the shallower the depth of field, and the closer the shooting distance, the shallower the depth of field. The general experience is that the depth of field of telephoto lens using close-up lens is smaller than that of macro lens. When using close-range lens, shortening the focal length of the lens is more obvious than increasing the shooting distance, and narrowing the aperture can also significantly increase the depth of field.

14. Do I need to remove the ultraviolet lens when using the close-up lens?

If the advanced UV mirror with multilayer coating is used, it is not necessary to remove the UV mirror. If the low-grade UV mirror, especially the UV mirror without coating, may have a great influence on imaging, it is recommended to remove the UV mirror.

15. Can close-ups be superimposed?

XPRO close-ups can be superimposed, which has little effect on imaging quality. However, in view of the bearing capacity of the main lens, XPRO does not recommend superposition, and even superposition is only recommended for internal focus lenses. In order to meet customers' multiple requirements for magnification, XPRO has designed close-ups with various magnifications and calibers to choose from.

16. The longer the focal length of the main lens, the better?

Although the longer the focal length of the main lens, the higher the magnification, but not as long as possible, because the focal length is too long, it will lead to extremely shallow depth of field, shooting difficulties, and even unable to focus automatically. Manual focusing can be used at this time. Close-up lens is recommended when the focal length of the main lens is less than 300 mm

17. Can a close-up lens use multiple lenses?

As long as the bearing of the lens allows, you can use the same close-up lens through the adapter ring. XPRO recommends that the gap between the lens aperture and the close-up aperture should not exceed two levels.

18. Can I use small-caliber close-ups for large-caliber lenses?

Generally speaking, close-ups are used for medium telephoto lenses, and the viewing angle is relatively small. Therefore, under the condition of not affecting the imaging, the close-up lens with small aperture can be used for the lens with larger aperture by reversing the connecting ring, but the aperture difference between the close-up lens and the main lens can not exceed one step, otherwise a dark angle may appear.

19. How to estimate the magnification after using a close-up lens? 18-200mm and 70-200mm lenses use the same close-up lens with the same maximum magnification?

The magnification after using the close-up lens is closely related to the magnification of the main lens itself.

In most cases, the magnification after close-up can be estimated by referring to the following formula:

1/N =(N+ 1)/N *(F/F+ 1)- 1

Magnification of main lens-1/n, focal length of f- lens (mm), focal length of f- close-up lens (mm).

For example, Nikon 85/ 1.8, and the magnification is 1/9.2. After using a close-up lens with a focal length of 250mm, 1/N = 0.486, which is about 1: 2. Using a close-up lens with a focal length of 500mm, we get 1/N = 0.279, which is about 1:3.6.

Through experiments, it is found that the estimation accuracy of this formula is usually high for lenses with a focal length less than 200mm, and there will be obvious deviation for lenses with a focal length of 300mm, which may be because the focal length of the main lens is too long and the deviation of the optical center of the lens is relatively large, which leads to that the formula cannot accurately estimate the magnification and needs to be measured.

20. Most DCs have macro functions. Do you need a close-up?

The macro function of DC is generally realized at the wide-angle end, and the shooting distance is usually only a few centimeters or even zero distance, which is not an advantage in practical application. Because such a short shooting distance is almost impossible to get close to insects, and being too close often blocks the light of the flash. In addition, the macro of DC at the wide-angle end will produce exaggerated deformation, and the surrounding objects will also appear in the picture, so the macro perspective effect of DC is very different from that of SLR cameras, and it cannot achieve the long focal length compression space and blur effect at the wide-angle end. However, the use of close-ups can also make DC achieve the same perspective effect as SLR at the telephoto end, especially telephoto DC, which can take macro photography at a distance of tens of centimeters, which is very necessary for shooting insects and light distribution.

2 1. After using the close-up lens, it is found that there is color edge (color difference) at the edge of the object in the image. Will this lose the achromatic effect?

As an additional filter, the final imaging of the close-up should be determined by the main lens and the close-up. Achromatic close-ups only basically eliminate their own chromatic aberration, but can not eliminate the chromatic aberration of the main lens. Even if no filter is used, some lenses will still have obvious chromatic aberration, especially in digital SLR, and this phenomenon still exists after using close-up lenses. Therefore, when it is found that the highlight edge of the close-up lens has obvious chromatic aberration, please take off the close-up lens and shoot it with the same aperture to see if the main lens itself has chromatic aberration.