Magnfication, distance, focal length, numbers, errr...
Ok, so it turns out I could use some help on my magnification math. It may be "easy" as I said earlier, but for someone other than me. Basically, I'm not sure what formulas to use.
I need to make an object that is X mm in size (.05mm let's say, for now) appear as Y mm (.005-.01mm in this case) on the film. I have a 180mm lens. At what distance do I need to have my lens at to achieve this?
Thanks in advance!
update..... 1/f = 1/u + 1/v
magnfication... M = v/u
f is focal length, u is subject distance, v is lens to film distance
Is this all I need? This is embarassing, I mean, I supposedly passed calculus! You would think that this simple algebra would be a breeze...
Last edited by holmburgers; 06-01-2010 at 12:45 PM. Click to view previous post history.