Hello and greetings to you all.
I have a question... (obviously!)
If I have a lens (lets say a 150mm lens) on a 4x5 camera and I take a head-and-shoulders portrait. The subject is say 1m from the camera.
OK. I put these figures into the Bob Atkins DOF calculator ... and I get a certain 'magnification'.
If I want exactly the same image but on 5x7 film on a 210mm lens what will be the 'magnification' ? ... and the same again for a 300mm lens on an 8x10 camera...
I'm certain someone knows this ...
Do I get his magnification figure off the DOF calc and multiply the 4x5 figure by 7/5 for the 5x7 and 10/5 for the 8x10 ?