Macro lenses and close up filters

[ameerat42]

Hmm! That's not bad. I measured a 30mm across your 36mm frame, giving a 1.2:1 magnification. That's slightly more than 1:1. By convention, the numbers are written

relative image size - to - object size.

(At least that's how I have understood it, so that eg: 1:4 means the image size is 1/4 the actual size of the object.
Am.

[Doninoz]

Now I am totally confused! I need to take a lesson in maths...

[ameerat42]

Nah! It'll clear up. Use the "mud filter"
(I should have said: "...I saw an image of 30mm of the ruler across on your 36mm frame...")