Recent content by Mohab

Thanks for your reply BvU, I've looked up to the moon with it, the moon appeared smaller, I think it has a negative focal distance.

I'm trying to make a handmade telescope, but I'm stuck with the lenses I bought 2 lenses. they are the same "convex from one side and concave from the other side" like glasses lenses. then I knew that I need a double convex for both the object lens and the eyepiece lens. so I decided to put the...