Okay so I want to make a telescope at home... Im not a noob. Even if I am please just help me. I've got a couple of magnifying glasses ..pretty big .. I don't know the exact focal length... But one of them is twice the size of other... As soon as the sun comes up I'll find their focal length s... What I want to know is how far apart the objective lens and eyepiece should be kept for clear and maximum magnification... I just need a formula or some way to calculate the dist between them. Also , how to fix the inverted image that will be formed by using the two lenses I have...I know I'll have to use another lens but again how far should it be placed and of what focal length should it be. I want an erect image.. Assume I have two lenses of focal length F , one of 2F...if you need... Please correct me if i'm wrong...anywhere.. I'm willing to get any other materials I might need ..