Canon Lens Cheap
What size of a lens cap needs a canon 200 mm lens and where I can buy one?

I recently purchased a canon 200mm f was only $ 15 and was in perfect condition, even if does not have a lens cover does any no where I can buy a cheap one that fits and I do not need any the size and shape to find out? thanks soooo much thank you very much I guess there's just some things that people do not teach or just do not learn until you need it

Check your lens. There should be a symbol and the number for the size of the lens cap, examples: Φ58, Φ77, Φ77mm, etc. Be careful not to confuse the focal length of lens filter size. Lens focal length should be marked as 200 mm. As for where to buy, try your nearest store camera decent. Or order online from places like bhphotovideo.com or adorama.com or porters.com.