Traditional Culture Encyclopedia - Photography and portraiture - What is astigmatism photography?

What is astigmatism photography?

Recently, I have often seen similar photos, using the effect of out-of-focus or correct focus cross to present this dreamy work. Blur the focus of the background scene or subject correctly, then emphasize the part to be attracted, and then soften and blur the background. In fact, this photography technique has a name. It is called "lens" or "defocus imaging".