After a lapse of 8 years, Canon’s 70-20mm f/2.8L IS finally ushered in another update. The 3rd generation EF 70-200mm f/2.8L IS enables a new coating style and is further optimized for optical performance. As the most signature lens product of Canon, the new 70-200mm f/2.8L IS III USM continues its professional flagship positioning.
Lens focal length: 70-200mm
Lens structure: 19 sets of 23 pieces (including 1 piece of fluorite lens, 5 pieces of UD lens, ASC coating technology)
Aperture range: f/2.8 – f/32
Recent focusing distance: 1.2m
Maximum magnification: 0.21x
Filter size: 77mm
Lens size: about Φ88.8×199mm
Lens weight: 1480g
The biggest change in the optical design of the camera is the introduction of a new ASC coating that further enhances the lens’s anti-glare capability. Based on the original good image, the improvement of the new generation lens mainly allows the new lens to maintain better stability under different shooting conditions, and reduce the influence of glare and other factors.
Appearance & Control
First look at the appearance, the biggest change in the new generation of Canon EF 70-200mm f/2.8L IS III USM is the color of the body of the mirror. The white color of the new lens is cooler, and it is significantly different from the previous two-generation products. Therefore, the two-generation lens can be well distinguished from the color alone.
In terms of handling, the control interface of the new generation EF 70-200mm f/2.8L IS III USM lens is exactly the same as that of the previous generation. From the focus to the anti-shake function selection, users familiar with the previous generation can easily get started with this new generation of 3 lenses. To complete the operation and shooting.
As far as I am concerned, I don’t use this lens a lot. My dad prefers to use this lens.
With the continuous development of modern computer information technology and the Internet, more and more personal brands are gradually emerging through the Internet economy.
As the personal brands are being popular in nowadays, Network protection and security of personal brands have become very important. For online security, an account is often used in the form of a password to ensure security. This password is often only set and remembered by the brand account owner.
Although saving your password will help you log in the next time, it carries a lot of risk. Clear history and cookie records on a regular basis. When we log in to the mailbox and some personal homepages, our account and password will be forgotten. This way, hackers can access your information.
Also, we need to care about the Privacy level. We can increase the privacy level of regular browsers according to their individual needs and adjust the privacy level of their favorite computers.
After almost 1 month in this community， I found even I have 11 years experience of the photography， I still can learn so many things from this community members.
I always can see many awesome photos in this community and I will give some comments, and the photographers/ posters are always very friendly will give me answer. Sometimes I do not know how can I take the photos as good as they did it, I will ask how can they do that, and they are very happy to share the ideas. In this community, everyone can say quite friendly and warm-heart, even only been here for 1 month, I learned a lot of things.
Intellectual property is the invisible creation by our mind. It can be invention, design, name, logo and so on. There are so many things like these that you may think they are your intellectual property.
The role of intellectual property in international economic competition is increasing. We need a full understanding of intellectual property
To say Intellectual Property in the legal sense, Intellectual Property requires copyright, patents and trademarks.
Copyright
With material rights, no other person may sell or manufacture the same article without the permission of the obligee. It dose not include rational use.
patent
Own the right to an idea, which can be a business idea, new engine technology, or anything that doesn’t yet exist, and is a new technology to improve an existing approach.
Trademark
The right to own a brand, logo or slogan that no one else can use or make.
Copyleft is a way to protect program copyright. This does not mean giving up copyright; in fact, it is not copyleft. The word “left” in Copyleft has nothing to do with the verb “away” – it’s just the opposite of “right”.
Copyleft is a general method of free programs or other work, and requires all modifications and derivatives of programs (or other work) to be free.
The easiest way to make free software is to put it in the public domain without copyright restrictions. If they are smart enough, they should be allowed to share plans and improvements. But it also allows those who are reluctant to cooperate to turn the project into proprietary software. They can make changes more or less and distribute them as proprietary software. Those who have obtained a revised version of the procedure will not have the freedom granted to them by the original author because the intermediary cancelled it.
Copyleft allows anyone to make any changes to the program, but anyone who wants to distribute the program can get the original code. According to the Copyleft principle, all free software allows users to copy, modify and distribute freely, but the original code must be left to each user so that others can get the modified original code to ensure the distribution and development of free software. People who modify free software can certainly charge for providing modified software for other people’s use, but they can’t hide the original code to protect the original created intellectual property for public use, rather than a person’s profit tool.
How the Permissions system help to protect/open IP For my understand of this part, how can the permissions system help to protect IP is not an easy thing to explain. When we created an object in the second life, this means we are already to be the creator and the owner of this object. We can make permissions in our blog post about it. Such as not allow anyone to copy, modify or change it, not allow anyone do any illegally shared or sell without permission with it.
Creative Commons The user can clearly know the owner’s rights, and it is not easy to infringe the copyright of the other party, and the work can be effectively spread.
Four core rights
Attribution (BY): The original author must be mentioned.
Noncommercial, (NC): Not for profitable purposes.
No Derivative Works, (ND): The original work may not be modified and may not be recreated.
Share Alike, (SA): Allows modification of the original work, but must be published using the same license.
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