​Look at the world from a new perspective

​Look at the world from a new perspective

Objects closer than 10cm are invisible to the human eye. This means that the naked eye cannot detect more detailed textures. With the aid of a magnifying glass, canvas prints a more detailed shape can be observed. Macro photography is a new way of looking at the world. It is an important and fascinating branch of photography. The texture of textiles, the wings of beetles, the markings of cars, the dew on petals. This is a mysterious, exotic world of images that transcends the human eye's perception of detail.

Today's photographers' cognition of macro photography is mostly obtained from dedicated macro lens and a large number of network works. Close to framing, fine focus, and proper lighting, the photo was born on a more stable frame. But the photo error rate also often makes the photographer very grumpy, canvas australia sometimes want to get more micro scene but the common lens can only provide 1:1 magnification. To make macro photography better, we need to understand it from a global perspective.

Before talking about equipment, macro photographers should know more about its emphasis on a few words. They are: magnification, nearest focusing distance, effective aperture, large canvas printing and aberration.

magnification

Magnification is the magnification factor, usually refers to the ratio of the size of the final image seen by the human eye to the size of the original object after the object is magnified by the objective lens and then by the eyepiece, which is the product of the magnification factor of the objective lens and the eyepiece. Photography often said viewfinder magnification refers to the point, often expressed as a percentage. Magnification at the macro has a new meaning, referring to the ratio of image size to actual object size in the focal plane. Focal plane or film or digital sensor CCD, CMOS.

The macro is usually expressed as 1: *, and 1:2 means that the image in the focal plane is half the actual size of the subject. Macro photography is usually defined as a 1:1 magnification. Ultrafine photography generally means that the image is larger than the actual size of the subject, such as 2:1, 3:1.

To achieve a high magnification, the need for a closer shot, so called macro.

Closest focus distance

At close range, the image is enlarged as the distance between objects becomes shorter. A normal lens, on the other hand, cannot be photographed at close range. This is due to the fact that the normal lens is optimized for several times the focal length of the lens. The lens performs best when the distance is 100 times the focal length of the lens, and the aberrations are well balanced. Beyond that distance, the balance is broken. However, due to the need of composition, optical manufacturers still set the focusing distance of the lens closer. For example, the most recent focusing distance of a 50mm lens is about 45cm, but there will still be deformation and serious edge optical erosion (dark Angle) when framing within 1 meter. If the focal plane is less than 45cm away from the object, the lens will not be able to focus.

Look at the world from a new perspective

Note that the closest focus distance refers to the distance from the object to the focal plane, not to the front lens. What is marked on the lens is the closest focusing distance, and the working distance of the front lens is smaller than this parameter.

For greater magnification, the lens needs to be kept closer to the subject. The closer the focus distance is, the more distance the front lens can achieve. This method is the macro lens method used in macro photography.

Macro lens is a lens specially designed by optical manufacturers to achieve high magnification, which effectively corrects the difference in close-up photography and is expensive.

Effective aperture

The aperture F value of the lens is the ratio of the focal length to the aperture of the incoming light when the lens is focusing at infinity. However, when the focus distance is not infinite, the ratio will increase. In ordinary photography, the increase of aperture F value is not obvious, but when macro photography, the increase effect will be significantly enhanced. For close-up photography, the actual aperture F value of the lens obtained is F = F×(1 + M). M refers to the magnification, when the magnification is 1:1, the effective aperture will drop two gears. If the lens aperture is set to F4, when 1:1 macro is used, the effective aperture value is F8.

Modern cameras with TTL metering system, so can accurately metering. But the use of macro lens often feels the light is too dark, easy to shoot because of slow door virtual paste is the truth.

Aberration

The image obtained by the optical system is different from that by Paraxial Optics (gauss Optics), and there is a certain deviation. The deviation of optical imaging from Paraxial Optics is called aberration. The photographer can directly understand gaussian optical imaging as ideal imaging.

In macro photography, acrylic prints australia there are often live aberrations.

8th Jan 2020

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