Talk about dx

The principle of magnifying glass can be understood as: add a high-quality magnifying glass behind the original lens. He enlarged the original lens image by xx times, and then kept a 24x36 image in the center of the picture and sent it to the film, and cut the rest out. So it is easy to explain its characteristics: 1. Magnifier can not improve the resolution of imaging; 2。 The quality of imaging depends more on the quality of the original lens, especially when the quality difference between the imaging edge and the lens center is relatively large under certain conditions, it may feel better with a magnifying glass because the part with the edge difference is "cut off"; 3。 In most cases, after using the best magnifying glass, the effect can only be close to the original lens, and it is impossible to reach or exceed it; View original post >>