Users need to make use of really good software to perform true cleaning and/or erase of all personal and safety risk data left on your iPhone for the new user. Just imagine, as all these phones change ownership and new users not aware of the data recovery possibilities. Thats an impressive number and an impressive opportunity for criminals interested in personal data (theft). There are currently over 700 million iPhones in use worldwide. No additional privacy approvement needed by Big Sur to make you start from scratch. Just drag and drop the application to your Applications map and you’re done. Installation of iMyFone Umate Pro is easy and straight forward. The company is also known as iMyFone, iMyFone Software, iMyfone Technology Co., Ltd. If you encounter any problems using the product, please contact iMyFone support team for help. Founder is Dean Huang and the number of employees is about 200 persons. Plus the Sigma lens controls Chromatic Aberrations very well.IMyFone Technology company provides data restoration and erasing services/tools to Apple (IOS, MacOS) product users and is located at Shenzhen, Guangdong, China. The company is founded on Apr 10, 2015. Just as a note: I have compared sample shots I have taken with this lens and my old Minolta AF 70-210 f4 "Beer Can." This lens can match and even beat the Minolta lens on the overlapping zoom ranges. Keep it steady and you can get good clean sharp pictures under most situations. However, I like it and I have gotten great shots with it. The general build for this lens is great. I don't usually zoom on the fly with this lens. With this lens I pretty much choose my focal length first and then start shooting. However, it is right by my hand and I often end up touching the focus ring while it is focusing. If it was father up the barrel I wouldn't mind. I wish that the ring did not turn when auto focusing. I would have liked a slightly smoother focus ring. A zoom lock would have been nice when you are walking about and not necessarily looking for a shot. I hate it when I'm walking along and when I tilt my camera down the lens extends. Some times I have trouble getting auto focus when using the center auto focus point alone while tracking with this lens. Tracking is okay with this lens, but mainly in area auto focus.
Though, I have found if you use area auto focus when using the lens for birding or to capture any other moving objects auto focus improves drastically and will not necessarily be quick to start hunting as when using the center AF point most of the time as I do.
Once that happens you potentially can wait forever. However, once it starts to get dim and contrast starts to go forget about it. When it is bright outside and your target has plenty of contrast you will have fast auto focus lock. When it come to auto focus I think people can be too critical on this lens. So unless it is very bright outside for a fast shutter or you have a tripod forget about hand holding it for long periods of time and getting a sharp picture. I have a KM Maxxum 5D with the integrated anti-shake mechanism (image stabilization) and it helps a lot. Though, you really need to keep it steady or else you can get a soft image. I have gotten some good sharp pictures out of this lens.
But, I would say in part that it is simply due to the fact that it is a 400mm zoom after all.
I will agree that on the 400mm end pictures can seem a bit soft wide open or not. I think the lens can produce some really good sharp pictures. It seemed that the lens was well regarded. I came across this Sigma and I thought "why not." I checked out any official reviews I could find on the web (not many).
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