Photography knowledge


One.Types of digital cameras
There are two kinds of digital cameras: DC and DSLR.DC is the digital camera that people often use when taking photos for travel. DSLR is the digital single-lens reflex camera currently used by most sports reporters and journalists.
With the continuous upgrading of DSLRs, the continuous improvement of technology, and the price has also dropped significantly, it has gradually entered the family and has become a common equipment for many photography enthusiasts and enthusiasts.DC has long been a must-have handheld device.
two.The difference between DC and DSLR
The purpose of DC and DSLR is exactly the same. Exposure imaging leaves digital negatives for appreciation.But what is the biggest difference between the two?
The simplest difference between the two is that DSLR can change lenses, but DC cannot change lenses.This shows that the two exposure imaging structures are different.
DC is mainly exposed by CCD from time to time, and the instant image (or video) recorded at the moment of pressing the shutter is actually very similar to the principle of DV; while DSLR replaces the film (film) on the structure of the traditional SLR camera, usingCMOS感光元件来记录图象信息,摄影知识 td龙鱼的霸气浅谈所以他的摄影性能\原理\结果\质量,与传统的单反相机很接近.
According to the above main differences, DC and DSLR are currently divided into two grades in terms of function / use performance / imaging quality. In theory, two kinds of hardware are better than DSLR!Because of its lens quality, lens performance, body processing speed, standby time, shutter speed, ISO noise control, and smart functions that work with lights.* The feel and scalability are far more than DC (no matter how expensive or advanced DC is destined to lose to DSLR in this hardware PK, of course, this does not mean that the photos taken by DC must be better than DSLR(The photos are worse, but in terms of overall performance and function, it is indeed like this)
three.Some functions and parameters that need to be known in photography

Depth of field: After focusing, the thickness of the focal plane, that is, the depth of the clear and clear part of the photo

Aperture: Both DC and DSLR have this parameter, generally use F *.* Indicates that it represents the size of the aperture (the size of the lens opening and closing aperture when taking pictures), the larger the aperture, the smaller the value, and the minimum aperture of the general DSLR lens is F2.8. The aperture of some fixed focus lenses can be larger, reaching F1.8; F1.4, even F1.2 The size of the aperture greatly determines the depth of field. The larger the aperture, the smaller the depth of field, the more blurred the background and the clearer the theme. The smaller the aperture, the opposite is true.

Shutter speed: The speed at which the shutter opens and closes. Since objects are always in motion, even relatively stationary objects will actually have very small vibrations that are not noticeable. Especially in photography, relative movement is important, so the shutter opens and closesThe shorter the time, the clearer the instant picture can be grasped, and the longer the shutter opening and closing time, the image will move during this time, causing the picture to be blurred or even cloudy.

光圈快门速度:照一张清晰标准的照片,是需要一定的光量被感光元件接收处理保存,摄影知识 td才能形成一张数码相片,根据以上光圈和快门速度的定义,我们得知,这两者Determines the amount of light entering the CCD or CMOS. The larger the aperture, the larger the aperture, and the slower the shutter speed, the longer the light enters.So when the amount of light required for our imaging is fixed, the aperture is proportional to the shutter speed.Relationship, then, after metering, after knowing the amount of light we need, increasing the aperture of one level will simultaneously increase the shutter speed by one level.If we slow down the shutter speed by one level, we also need to reduce the level by one.Aperture.This will ensure that our shooting is not overexposed or underexposed.

ISO: In the past, traditional cameras used * film negatives to record the image. When the film was produced, the ISO value was marked according to its sensitivity speed., The smaller the ISO, and vice versa; so to today s DC and DSLR, our cameras have used electronic photosensitive elements such as CCD and CMOS to receive the optical signal to record the picture, so the electronic photosensitive element is set according to the sensitivity of the corresponding film negative.ISO grades to meet the photographers different photography needs in different environments, different occasions, and different needs.

Focal length: We often say wide-angle, ultra-wide-angle, telephoto, short-focus, medium-focus, medium-telephoto, etc., that is to say, this focal length, focal length is the parameter of the lens photography distance capability and function.General DSLR lenses have parameters with a focal length. For example, classic zoom lenses have 17-40MM, 28-70MM, 70-200MM, which means that the lens can be zoomed at will within the focal length range.Written is 85MM, 105MM, 135MM, 180MM, 200MM, these are fixed focus lenses, meaning that the lens can only take pictures in the fixed focus section, theoretically, the imaging quality of the fixed lens of the same level is better than the zoom lens.As for DC, we often see 3X, 5X, 7X, 10X written on the camera body, which means that the cameras zoom capability is 3x zoom, 5x zoom, 7x.10 times, which is consistent with the standard marked on the ordinary DV (digital video camera), which represents that the camera lens is a zoom lens, and its telephoto end is divided by the multiple of the short focal end. Generally, the short focal end of DC is 28MM or35MM, so the DC focal length of the 3x zoom is about 28MM-80MM, which is basically the same as the focal length of the DSLR lens.For example, the DSLRs classic focal length 70-200MM can also be called a 3x zoom lens (but generally more professional photographers will not say such unprofessional words).In general, the zoom factor is the zoom ratio, and the smaller the zoom ratio of the same level, the better the imaging quality of the lens with the larger zoom ratio.

four.Simple application of digital camera in aquarium photography:

After understanding the above parameters, we will simply introduce the more basic techniques in aquarium photography to you, and introduce some other advanced techniques and techniques in the future.
When we were shooting in the aquarium, the three main problems we encountered were the brightness of the light, the clarity of the object, and the performance of the details of the object

Photography knowledge AROWANA Forum 1, the brightness of light
We often find that the photos we take are too dark after taking the photos, and we cant see anything clearly, or they are too bright and overexposed.
This needs to adjust the aperture size and shutter speed.If it is too dark, increase the aperture and slow shutter speed.If it is too bright, the opposite is true.Generally, whether we use DC or DSLR, we have automatic sidelights.Generally, the camera can automatically adjust the appropriate for usThe combination of exposure.However, the lights of the aquarium are generally not as bright as the sun, so photography in insufficient light and dark environment, even the largest aperture can not meet the shutter speed we can accept (the average person holding the shutter speed cannot be less than 1/60 second,Otherwise, the imaging is very easy to be false) .In this case, we need to increase the light and strengthen the light.If we can not increase the light, we can only increase the sensitivity by increasing the ISO to achieve our purpose to meet our requirements. If the light is too bright (this generally does not happen), then increase the shutter speed.If the shutter speed has been adjusted to the limit, reduce the aperture and reduce the amount of light transmission.
2 Object clarity
First of all, to ensure the clarity of the object, it is necessary to ensure a relatively high shutter speed. Since the human hand is shaking, the mirror of the SLR camera is also shaken when it is raised. Even if you use a tripod, there will be a slight vibration, which affectsThe clarity of the image can be basically guaranteed as long as the vibration is controlled within the allowable range.However, in aquarium photography, especially when shooting objects such as fish and shrimp, the animals are moving and are not fixed, so we must also consider the speed of the objects movement, correspondingly increase the shutter speed, and increase the ISO value and increase the aperture, but the ISOThe higher the accuracy performance of the photosensitive CCD and CMOS, the worse noise will be generated during imaging (small particles of green and green on the negative screen) .According to the performance of each camera, the ability of noise suppression is also different, such as 20DBelow ISO800, noise can be tolerated, and 5D noise suppression is very powerful, and rarely produces noise at ISO1600.Therefore, it is necessary to understand the limit value of the camera ISO and the ability to suppress noise in order to take clearer photos.
3 Performance of object details
For aquarium photography, we want to get more details, such as the clarity of fish scale particles, the eggs of small shrimps, etc. In general, DSLR can choose the appropriate lens according to the photography requirements to achieve the purpose, such as photography with strict details and subject requirements, weChoose a telephoto lens (more than 200MM) or a macro lens to shoot, which can effectively shoot a large picture on the film, the details are clear, the depth of field is small, and the contrast is large, while DC can choose a special macro option to achieve the rightCapture the details of the picture.
In addition, in order to highlight the theme we want to express, the use of aperture and focal length to control the depth of field can achieve a strong contrast between the theme and the background, clear and blurry contrast.To achieve our intended purpose.How to choose parrot fish feedBlood Parrot Feed Formula$Which kind of blood parrot feed is good@Parrot Fish Feed Brand"Red parrot fish feed/Dry brine shrimp feed for parrot fish?Uniform Parrot Fish Feed:Special feed for blood parrot redness#

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