No one has answered. Let me answer it for you. Canon 7D is the flagship model of APS-C format. What is the flagship model? It is the leading model in APS-C format, and it is currently the strongest No. 1 camera in C format. Why is it in C format? Why not full frame? (C-frame means that the photosensitive element only has an area of ??40% of the full-frame) The reason is very simple, because the production cost of C-frame photosensitive element CMOS is much less than that of full-frame, and C-frame does not mean that it does not require outstanding body performance , there is also a need for a top camera like 1DS in C format, so 7D was born. Although the image quality and sensitivity of 7D are limited to C-frame, its performance is not inferior to the quality of full-frame. Although many people on the Internet are saying that the image quality of 7D is not good and not as good as the similar 5D2, but most of them do not own it. The 7D people said that the Canon official website also has samples of 7D and 5D2 for viewing. If you look carefully, the image quality of 7D is not inferior to that of 5D2.
In the past, the lenses used with the C-frame were relatively cheap and poorly made products, especially those from Canon. But with the birth of the 7D, we can’t give this flagship body cheap and poorly made lenses, so the new 15 The -85 lens was born. Although Canon doesn't pay much attention to EFS lenses, which are C-frame lenses, Canon's move is for the 7D. The 15-85 lens has a 24mm wide angle, and the focal length range is very practical. It is very good from wide-angle shooting of landscapes to telephoto shooting of portraits. Moreover, the 15-85 has the same level as the 5D2 kit lens 24-105, both in terms of image quality and workmanship. , are all quite good. It can be said that the 15-85 is a lens comparable to the 24-105 and 17-40. Of course, the 15-85 is more suitable for the 7D. Canon has also applied for a patent for the 15-105 not long ago. We are looking forward to the birth of the new lens and hope that Canon can develop a more outstanding EFS lens like the 15-85 F2.8.
So is it suitable to use a 7D with a red circle lens? Isn’t the red circle designed for full frame? That's right, the 7D can also use a red circle lens, and because the C format is small, the surroundings are not involved in the imaging, and there will be no vignetting on the 7D. For example, if the 7D uses a red circle lens like the 24-105, then the 24 will not It’s good for landscape photography, because the wide-angle end is not wide enough, what should I do? It doesn’t matter, the EFS lens group also has super wide-angle to make up for the shortcomings of C-frame wide angle. The 10-22 is a wide-angle C-frame lens, which is just connected with the 24-105. Of course, the great subsidiary manufacturers Sigma and Tamron have seen it. Canon has shortcomings in C-frame lenses and has vigorously launched a group of C-frame lenses. C-frame cameras have more lens support, and the prices are almost cheaper than full-frame lenses. The image quality is also very high. Sometimes you are not a professional photographer. If you are a photographer and don’t need to pursue top-notch lenses, then a C-frame camera is your best choice. For example, Tokina 11-16, 16-50, 50-135 is a complete set of three relatively perfect focal lengths, with excellent image quality and low price. Therefore, the 7D has a wide range of lens options. You can choose the C-frame lens for its price advantage, or you can choose the red circle lens for its image quality advantage. The choice is up to you. Finally, how big is the difference between C-frame lenses and red-circle lenses? Let me tell you this, unless there is a huge price gap between lenses, it will be difficult for you to tell the difference with the naked eye.