Hi and welcome to the forum:
It is hard to understand your issue. Certainly, we need more information:
1. What camera model do you have?
2. Precisely what lens are you talking about - please be very specific in reading off that is written on the very front face of the lens around the front element. e.g EF-S 18-55 IS USM f/4-5.6 or similar.
When you say you took the lens off, did you put on a wide-angle filter in front of the lens and now when you take it off the lens will not focus properly?
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
