POSTED: 23/12/2021 at 10:43pm  BY: Xeon MN Comments (0) Comment on Post

When autumn arrives, the foliage of the trees begins to take on brown, golden, yellow and green tones, so that the landscapes observed fill the eyes of the photographer, who advances by cracking the dried leaves on the ground, at the search for this image which can faithfully reflect this beautiful spectacle for all the senses. In this article, we present the first part of a series of tips for successful fall photos.
Fall Photoshoot Ideas - Corel Discovery Center

Tips for successful fall photos

1. Choose the place well

Before leaving your home to hunt for the most striking fall images, take the time to do some research on the Internet and identify some of the most emblematic places. You will find that with a little planning, it will be easier to find places that will meet your expectations. The beech forests and chestnut groves are the places par excellence for this type of photos, even if each place has its charm. In some places, the environment becomes monochromatic while in other places, it is the opposite: each species reacts differently to the fall season, for the benefit of a great visual variety.

2. Enjoy the parks and gardens

Even if they may not at first seem as spectacular as the wilderness, the usual places of frequentation of photographers can also give great fall photoshoots. The paths lined with trees and strewn with dead leaves, crossed by an embracing couple, are recurring images of this type of photo. So even if you are from the city, you have no excuse to stay home while the leaves fall from the trees.

3. Seek out the detail

To achieve a beautiful photo that represents the moment well, you don't always have to resort to open spaces or vast landscapes. Very often, a simple leaf, a mushroom, chestnuts open on the ground on a mantle of leaves or even children playing with dead leaves, are all subjects of interest to convey the essence of this season.

For this type of images, you will find very useful fixed focal length and bright lenses, with a focal range of 35 or 50 mm, macro optics or even cinema lenses.

4. Protect your gear from the rain

The cold and the rain typical of autumn can surprise you while you are out for a walk. To avoid unpleasant surprises and unnecessary risks for the safety of your equipment, do not forget to take a waterproof cover in your camera backpack. In this way, you will be able to react in time while protecting your equipment and not to miss a great opportunity to take great photos. If you don't have a cover yet, you can get by with a plastic bag and a rubber band. The main thing is that your equipment stays protected from the rain.

5. Change the color temperature

At the time of film photography, the use of a warm filter of orange color, was generally advised to reinforce the feeling of heat and autumnal of these brown tones which cover the ground and the trees. With the advent of digital photography, color filters have fallen into disuse since now the color temperature of your camera can be easily changed by playing a little on the white balance.


POSTED: 26/09/2021 at 4:21am  BY: Xeon MN Comments (0) Comment on Post

There is a direct relationship between the sensor used in the camera and the most appropriate lens. Parameters such as sensor size and pixel size are of major importance. The machine vision lens must be able to illuminate the entire sensor area to avoid shading and vignetting. It must also be able to resolve the pixel size. The higher the optical resolution of a lens, the more detailed the structures reproduced.

Machine Vision Lenses - DZO - DZO东正光学官网

The most commonly used machine vision lenses

The most commonly used type of lens for sensors with a resolution of less than about one megapixel is the universal lens with a standard fixed focal length of 4.5 to 100 mm. These machine vision lenses are optimised for focusing to infinity and have an MTF of 70-90 lp/mm with little distortion and vignetting. Shorter focal length lenses generally produce images with fisheye distortion.

Precision lenses, the high-resolution version of standard lenses, offer better viewing performance than standard lenses. They are generally available with focal lengths up to 75 mm, MTF above 120 lp/mm and very low distortion (<0.1%). They are particularly well suited for cameras with small pixel sizes or for precise measurement applications.

Macro lenses are available for small fields of view, approximately the size of the sensor. Specified in terms of magnification relative to the camera sensor, they are optimised for "close-up" focusing. Although they have very good MTF characteristics and negligible distortion, they lack flexibility as it is not possible to change the aperture or working distance.

At the other end of the scale are large-format lenses, which are needed when the sensor dimensions exceed those possible with a C-mount lens. They are usually modular, consisting of different components such as focus adapters, helical mounts and spacers.

Telecentric lenses are used in specialised metrology applications to avoid dimensional and geometric variations in images. These lenses do not suffer from distortion because they collimate the light entering them. This results in images with constant magnification, regardless of the distance to the object, without perspective distortion. Due to the parallel beam path, the aperture at the front of the telecentric lens must have at least the same diameter as the field of view. Lenses for large fields of view are therefore larger and therefore relatively expensive.

Electrically adjustable liquid lenses

New in the field of machine vision lenses are electrically adjustable liquid lenses, which bring many advantages to machine vision. They consist of a thin elastic polymer membrane containing an optical fluid that allows them to change shape (image 2). An actuator controlled by electrical pulses presses the liquid inside the lens from the outside, changing its curvature and achieving extremely short response times of a few milliseconds. They are particularly useful in applications where there is a need to change focus quickly, for example when inspecting cartons of different heights on conveyors. This unique principle allows faster and more compact optical systems to be designed without complex mechanics. An impressive MTBF (Mean Time Between Failures) of more than one billion movements means that the system has a very long service life, as the automatic adjustment of the lens relieves the other components of any movement. This optical device is a clear advantage for machine vision, especially for 3D microscopy or surveillance tasks.

360° lenses

Some applications require more than just a camera. For example, the inspection of complex objects with specific shapes requires views from different angles. For this purpose, there are special 360° lenses which, with the help of an innovative combination of lenses and mirrors, capture the object from all sides in a minimum number of shots. The top and sides of an object, the back and interior of a hollow object or one with a hole, different sides: this lens makes it possible to combine all these views into a single image. This technology benefits many sectors, such as the pharmaceutical industry, the automotive industry or in the food industry, especially for beverages.

For cylindrical objects, such as bottles, glasses, batteries or bolts, pericentric lenses are best suited to capture their specific features. Due to the particular path of the light rays through the lens, the light from the part of the object closest to the lens falls in the centre of the sensor, while the more distant parts are shown at the edges. The top and side faces of the object are thus captured in one shot, with the side views of the object surrounding the top face in the resulting image (image 3). A fairly common use in the pharmaceutical and beverage industry covers the inspection of bottle neck threads and the reading of Datamatrix codes, which will always be read correctly, regardless of its positioning. The smaller the diameter of the object, the greater the height of the object that can be inspected, while thin objects can be inspected over a larger diameter. For small objects (up to 7.5 mm in diameter), the use of catadioptric lenses is recommended. These lenses are designed to observe the sides of the object with a wide angle of view, close to 45°, which allows complex object geometries to be inspected with adequate perspective.

For more information, please check on https://www.dzoptics.com/en/


POSTED: 29/04/2021 at 5:29am  BY: Xeon MN Comments (0) Comment on Post

CCIE Certification is not only the stepping stone of high salary, but also has high social recognition  in IT industry. It proves the holder's expert level of technology, which help holders get well paid, but its function is not only that.

Why Do You Need CCIE Certificate?

1. CCIE Brings You a Good Job and Good Treatment

If you look at the recruitment positions of network technology, such as network engineer, you will find that most companies' recruitment requirements will specifically indicate that "those with CCIE certificate are preferred". This is because the existence of CCIE certificate is enough to prove the holder's network technology level.

In addition, the salary of CCIE certificate holders is much higher than that of ordinary technicians. According to their experience and positions, many people can earn USD 15,308-45,923 a month.

Therefore, CCIE certificate can often bring you a good job, high salary and good treatment.

2. CCIE Helps you Enter Foreign Enterprises and Go Abroad for Further Study

CCIE certification, launched by Cisco in the last century, is an Internet expert certification examination, which is recognized by all countries. Therefore, when you get the Cisco CCIE certificate, you will undoubtedly get a global pass.

In the future, whether you want to enter a foreign enterprise or go abroad for further study, CCIE certification can provide you with the convenience of icing on the cake.

Of course, since CCIE certification can bring us so many considerable benefits, its qualification is relatively more difficult than other Cisco certification, such as the new CCNP exam.

But don't worry, as long as you choose a good training institution, you can improve the success rate as much as possible. For example, the SPOTO training institution is a not bad choice.

What Are the Advantages of the SPOTO Training Certification Agency?

First, tailor-made learning plan with high qualification rate.

According to the actual situation of students, the SPOTO tailor-makes reasonable learning plan. Students can master CCIE examination knowledge only by doing well according to the plan content.

And the training of SPOTO also provides one-to-one follow-up learning and answer and guidance services. It is such a serious professional training attitude that makes CCIE LAB qualification rate of SPOTO students reach 96%.

For more information about CCIE certificate, please consult with the SPOTO customer service.

Welfare time: CCIE Certification Course audition is open for free, and you can immediately seize the opportunity.






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