Is there anyway to find out how many megapixels would be required to get a level of detail on an object of a certain size? I'm wanting to clearly veiw lettering that is about 1ft*5ft that s on an object about 200ft long. The object would fill the frame.
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Not a duplicate, but you can derive your answer from https://photo.stackexchange.com/q/12434/26456 – Olivier Jun 17 '17 at 18:34
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This is not a mathematical aproach but an empiric one. Draw an example on a vector based program.
Figure 1 is a 24mpx representation of the object and text you describe. Download to see them in real size.
The text is 5/200 of the total length of the image. It is the same as 1/40. So if a 24 Mpx has 6000px width this text will have 6000/40=150px.
Figure 2 is a 56Mpx.
The level of detail depends also on the font used, and the sharpness of the lens.
Rafael
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