working out magnification.

[wez130]

Let me see if this is right, my sensor is 22.5mm x 15mm (canon 30D), therefore if i take a macro photo of a ruler and it fits 12mm into the frame, i'm getting just over 2:1 magnification right?

that's a resized full frame shot

http://www.wesleybrookes.co.uk/pics2/scale.jpg

link to full size shot.

 

[Slapo]

22.5:12 = 1.875:1

That's your magnification.

 

[wez130]

ha, not bad hehe.