SLR camera lens into the dust how to clean?
But guard against the staff flicker you, you go to say with high pressure blowing, do not have anything else to do. If the sand is not into the gray, then the trouble is big, the impact of quality does not say a long time wishful blocking the focus ring, once the zoom ring repair is particularly expensive. You'd better get a regular store to let someone deal with their own do not fiddle. I was eating this loss, I came back from the desert shot a shot because the sand into the too much scrapped
First to determine the shadow does not affect the imaging, if not affect the amount of strength do not rub, because the lens above a layer of fluorite coating, old wipe bad. If you really want to rub the gray position, it may not be on the lens, perhaps on the CCD or mirror or viewfinder.
If it is really gray on the lens, then the lens down, the zoom ring screwed to the maximum, blowing with the air and then rub the cloth with a mirror before and after the wipe (must use a special brushless cloth, or Not as much as do not rub tens of thousands do not use lens paper, that stuff is too bad) rub and then blow. Not enough to get the store to let someone with a high pressure air blowing like a lot of money can not spend much money.