Half-frame is difficult to recommend, because the viewing angle is equivalent to 1.5 times, and the three large apertures commonly used by Chinese portraits in Quan Huafu, 35MM 1.4, 50MM 1.4, 85MM 1.4, do not play much role. If you like to shoot small fresh literary girls indoors and like the studio of the coffee shop library, these suggestions are to buy an intelligent 35MM 1.4 artistic lens. In 7200, it can be used as the standard head of 1.4 large aperture, and can take most portraits. If it's cheaper, you can enter Nikon 35MM 1.8DX head. The picture quality of this head is good, but due to the aperture, the blur ability is weak. Moreover, after upgrading the whole camera, this head is useless. If you like to take close-up portraits, you can focus on 85MM or Sigma Black 5 70-200f2.8 ... But when taking portraits, you should use the perspective of your head first, and don't want to change other heads. In addition, I recommend you a book (Japanese fresh portrait photography (literary style photo techniques and later period). The sample photos in this book are basically taken with a 50MM head. You can focus 35 on the 7200, which is equivalent to 50 viewing angles, and then the aperture is larger. The blurring effect is the same as that of F2.4, F 1.4-2.0. It is suggested to pay attention to 1.4 directly to avoid detours and repeated investment.