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Magnifications
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 ?
Cheers.
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Re: Magnifications
You can't really get "exactly the same picture" since the formats have different ratios.
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Re: Magnifications
I think you are actually talking about 'angle of view'. Use this for calculating what you know for the 4x5 with the 150 and then calculate the lens+format for the others and compare the view for the horizontal and vertical angles.
http://www.mat.uc.pt/~rps/photos/angles.html
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Re: Magnifications
Oh all right then ...
Instead of 'exactly' insert the word pretty 'much the same' ... :-)
Thanks Darr. I think it might be. I'm trying to understand the DOF for the same image on various formats.
Cheers,