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Unveiling the Secrets of Camera: Exploring the World of Craft Beer

If you add up both digital conventional compatible lenses and digital exclusive lenses, the lineup is huge. Faced with so many lenses, how to choose and on what basis may be a problem faced by many DSLR users. In this article we are unveiling the secrets of camera. Let’s begin!

In order to facilitate users to have a reference when choosing a lens, Japanese photographer Nobuyuki Baba believes that when purchasing a camera lens. It is mainly based on the four major aspects of focal length, maximum aperture, close-up capability and expressiveness. Below, I will introduce these four aspects to you in detail. 

Principles of Lens Selection in Photography

1. Focal length

The first thing to pay attention to when choosing a camera lens is the focal length of the lens. The focal length is actually a matter of viewing angle. Different focal lengths also have different viewing angles.

In addition, I need to be clear about what is the main purpose of buying a camera lens? Is it to shoot landscapes or people, etc. As we all know, it is better to use a wide-angle lens to take pictures of landscapes.

While it is better to use a fixed-focus, medium-focus or telephoto lens to take pictures of people. Therefore, you must first decide the focal length of the lens you want to buy based on the purpose of photography.

The best focal lengths for shooting landscapes are the wide-angle focal length 24mm and the telephoto focal length 200mm.

When the wide-angle focal length of a standard zoom lens evolves from 28mm to 24mm, the angle of view becomes larger, and the range of scenery that can be accommodated is greatly expanded. Generally speaking, when shooting landscapes, the maximum aperture of the lens is not very demanding.

If you mainly shoot landscapes, a wide-angle focal length of 24mm is basically enough when choosing a zoom lens. As for the telephoto focal length, it must be at least 200mm. It would be more ideal if the telephoto focal length is 300mm or 400mm, and the degree of freedom will be greatly improved.

The telephoto focal length of a traditional zoom lens is mostly 300mm, but when used on a digital SLR, it is 450mm. The focal length is expanded by 1.5 times, making it more enjoyable to use.

The best focal length for photographing people is 85mm

According to the 35mm specification standard, when photographing people, the lens is basically selected based on the 85mm focal length. Portraits taken with the 85mm focal length are basically close to those taken with a medium-format camera.

Not only do the distances feel appropriate, but the faces of the people appear very natural, and the distance between the camera and the subject can basically be maintained at a normal talking distance. The 85mm focal length can also blur the background very well and highlight the characters.

To get a good blur effect, you should choose a lens with a large maximum aperture. The focal length of 85mm is about 135mm on a digital SLR. Although the distance perception of the picture taken is slightly weaker, it is basically not a big deal, so the focal length of the lens for shooting people should be at least about 85mm.

For taking pictures of flowers, a 100mm macro lens is enough for a traditional SLR.  A 100mm macro lens can take pictures at equal magnifications and can take pictures of flowers very large.

However, when taking pictures at equal magnifications or close to equal magnifications, due to the long focal length The depth is easy to cause shake, so anti-shake measures should be taken into consideration when shooting.

From this point of view, the 50mm macro lens is easier to use on a digital SLR. buyers also visit at currys discount code NHS.

2. Maximum aperture

The real value of the maximum aperture is to increase the amount of light entering in low light situations, thereby achieving the best exposure combination.

Photographing landscapes generally does not require the blurring ability of the lens. In addition, except for particularly dark places, the lens aperture is generally not very demanding.

However, when a 70-200mm zoom lens is equipped with a 2x teleconverter to change the telephoto focal length to 400mm and uses AF to automatically focus, it is best to choose a lens with a maximum aperture of F2.8.

A large aperture facilitates accurate focusing in darker conditions. Use a large-diameter lens to take pictures of people even in low-light areas, and you can use the handheld camera to take pictures using natural light.

In addition, a lens with a large maximum aperture can bring a faster shutter speed, so portrait photography also requires a large-diameter lens.

Another reason to require a large lens aperture is to be able to blur the background freely and ensure the quality of the blur.

When the aperture of a lens with a maximum aperture of F1.4 is reduced to F2, both the image quality and the blur quality of the background are better than those of a lens with a maximum aperture of F2.

Therefore, reducing the aperture of a large-diameter lens by one stop is of considerable value, and any photographer must be good at utilizing this feature of the lens.

3. Close-up shooting ability

The close-up shooting ability of a lens is another key point of selection after focal length and maximum aperture. This is true whether you use a wide-angle lens, a standard lens, or a telephoto lens. So, what is the appropriate close-up capability?

First, let’s talk about the wide-angle lens for shooting landscapes. The close-up capability has almost nothing to do with the wide-angle lens.

However, when shooting flowers and other subjects with a vast landscape as the background, insects are often required. The flowers should be photographed larger. In similar situations, the close-up capability of the wide-angle lens becomes very important.

The existing 50mm standard lens has a close-up capability of around 45cm, which is basically sufficient for use. However, when a large-diameter standard lens is used at the shortest photographic distance, there is often a large aberration due to the extended lens, resulting in poor image quality.

You must be mentally prepared for this when purchasing and using it. If the telephoto lens is used to shoot landscapes, there is no big requirement for close-up shooting capabilities.

However, if it is used to photograph people or flowers, the close-up capability of the lens is very important. You can also check at ao discount code NHS.

4. Expressiveness

When choosing a lens, the first thing many people pay attention to is the imaging sharpness of this lens. The purpose of the photo determines what kind of sharpness the lens requires. High-priced high-quality lenses are mainly used by professional photographers.

If you are just doing general photography, there is no need to spend a lot of money on high-priced high-quality lenses.

In addition, the imaging sharpness of the lens is also directly related to the aperture size. When a lens shrinks one or two stops from the maximum aperture, the imaging sharpness will be greatly improved.

5. Distortion

Distortion is an optical phenomenon caused by the optical performance of the lens. It is impossible for every lens to be free from distortion. Manufacturers correct the distortion when producing lenses and strive to control the distortion to a minimum.

Generally speaking, there are three main types of lens distortion: barrel distortion that easily occurs at the wide-angle end of a zoom camera lens, pincushion distortion that easily occurs at the telephoto end, and hat-shaped distortion that occurs after barrel distortion is corrected at the wide-angle end.

As far as the current status of lenses is concerned, the most prominent problem is barrel distortion at the wide-angle end. When purchasing, you should try your best to choose a model with less barrel distortion.

6. Blur

The blur in photography is beyond the capabilities of the human eye, so it arouses great interest from people. There is a quality problem with blur itself, and there is a difference between clean and dirty.

If the background is blurred beautifully, the image will appear soft. If the background is blurred dirty, the light will be scattered to the four corners of the picture. The blurred part will not be a beautiful circle, and in severe cases, it will form a double blur state.

With an ideal lens, the light will be dispersed evenly, creating a very natural blur state. The ability of a lens to blur the background is also related to the lens diameter.

For many lenses, the image immediately becomes sharper after being reduced by one or two stops from the maximum aperture, but the blurring ability is relatively reduced. The ideal lens will produce sharp images at its widest aperture, with good blur. Customers also view at photo universe discount code NHS.

3. Backlighting 

When taking backlight photography, strong sunlight or other strong light sources are repeatedly reflected on the mirror surface, which will form halos and flares on the screen.

This small portion of light that forms halos and flares will not only not be imaged on the screen. But will also form random reflections in the mirror and reduce the image quality.

To prevent this phenomenon, a lens hood must be used when taking backlight photography. Excellent lenses adopt processes to completely prevent halos and flares during the manufacturing process. The contrast is very good even when shooting against the light.

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