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The calculation depends on what 300m lens you have. If its the canon f4 then your focal lengh in is 308mm (apperature x focal ration. ie 77 x 4) This gives 4.95 arc sec per pixel on the 300D.
The Pixel size in microns for the 300D is 7.4
So calculation is : 206.265 / (focal length in mm of 308) *(pixel size in microns of 7.4)
26.25 / 308 * 7.4 = 4.95
Best Regards
Chris
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