DIY Add on diopter

Started Oct 26, 2013 | Discussions thread
OP dickiedoo Forum Member • Posts: 60
Re: DIY Add on diopter

Stephen Barrett wrote:

Hello dickiedoo,
You can get an approximate measure of the focal length of your closeup lens by focusing a distant scene (eg a tree outside the window) onto a wall and measuring the midpoint of the lens to the wall.

Can you explain that in a different way,I'm not following you


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