The lens toilet paper is wiped

when I just played SLR, I also wiped it with a paper towel. I've rubbed it several times. Take a magnifying glass to see if there are any thin lines on the lens. Actually, it doesn't matter much. If there is no obvious problem with the quality of the picture, leave him alone. < P > The main reason is that the paper towel is too rough and there is a coating on the lens. If I rub it hard, it will be miserable, which will affect the imaging power and increase the aberration.

dust, buy a blowing ball with a brush, and blow the dust with air

If the water is greasy, take it to the store and wipe it. If it is really necessary, wipe it with suede or camera paper.