This also sounds like a homework question. What have you been able to find about the two. At least summarize what you know about each and then we can help you identify differences and focus (no pun intended) on the key ones.
That's not like homework it's from my project i'm trying to get some information,ideas etc.
im just asking do u have any idea? if you havent why you're sending message to all my subject and why you are making spam.. Need more post? if you need you can go to kindergarden.. here isn't ...
Make some research and you can use internet in order you to have some information
so that you can determine what are the difference between telescopic and telecentric system.