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.