Hello! 6500 with Longteng 2875 lens or Sony's 18 105G, which image quality is better?

The picture quality of 1 and 28-75 is definitely better, because the specifications of this lens itself are much higher than 18- 105. However, since the combination of a half-frame camera and a zoom lens is selected, we should not demand too high quality, and mainly consider the issue of ease of use. 28-75 is a standard change in Quan Huafu, but it is no longer a standard change when used in a half-frame camera. The first thing to consider when choosing a lens is the focal length. The focal length determines the viewing angle, which is the most critical. As for the picture quality gap, there is no gap at all in many cases. And I also said, if you really care about image quality, who will choose the combination of a half-frame camera and a zoom head? Quan Huafu system can be bought at the same price.

2. There is nothing wrong with the Quan Huafu head and the half-frame machine as a whole. Many semi-professional or quasi-professional airframes, such as Canon's 7D series and Nikon's D500, all adopt half-frame specifications, which is also the reason. Of course, if possible, it is best to match a specially designed half lens. On the one hand, half lens is often more cost-effective than full lens. On the other hand, smaller specifications can make lens design more free and fully optimized. In fact, more often than not, it is also a helpless move to match a half-frame with a Quan Huafu lens, because only Fuji and Pentax are the main products of camera brands on the market, and other relatively mainstream brands such as Canon, Nikon and Sony mainly make full-frame camera systems, so there are not many choices for special lenses for half-frames, such as 18- 105. I don't think so. 18- 105G is actually the cover of an e-mount camera, and many designs are not needed when taking still photos.

3. As for the view that the image quality is degraded, whether it is pixels per inch or structural defects, these are the problems of lens design and manufacturing itself. A considerable number of lenses on the market have low standards, and it is difficult to meet the demand of 40 million to 50 million pixels. Conversely, some newly designed lenses can even meet the needs of over 100 million pixels. Moreover, in order to pursue better image quality, many lens designs are out of specification, that is to say, although some half shots are said to be half shots, their real specifications are equivalent to those of Quan Huafu, and some Quan Huafu can also meet the requirements of 4433 medium format. Therefore, it is actually a routine operation to match the low-standard fuselage with the high-standard lens. In fact, it is the fuselage that causes the degradation of image quality, because no matter what specifications of the lens are matched, the low-profile fuselage is definitely not as solid as the high-profile fuselage. Therefore, it is inevitable that the quality of a high-quality Quan Huafu lens will be degraded when placed on a half-fuselage, because the quality of the half-fuselage itself is not good.

4. There is also a special case in which the Quan Huafu lens is actively configured with a half-frame camera body, that is, in order to obtain a larger aperture, because Quan Huafu SLR lenses are very abundant, and the overall price is relatively cheap, and the half-frame camera body has a greater demand for lens aperture when shooting in dark light or shooting video, so you can switch the Quan Huafu lens by using the defocus brightening adapter ring to obtain a larger aperture. For example, directly using a small spittoon with 50 1.8 as a half-frame machine will get a portrait lens with a viewing angle of 75mm or f 1.8. However, if the lens is switched by defocusing and brightening the adapter ring, a super-large aperture standard lens with a viewing angle of 50mm and an aperture of f 1.2 will be obtained. However, due to the change of optical structure, the imaging quality will be obviously reduced.