Another pearl of wisdom to save in my memory bank.privatebydesign said:ranplett said:The 1/FL rule was for back in the days when film resolution was fairly forgiving, unlike current 50+MP images. Also, when shooting a lot of frames (something we didn't do with film), fatigue and bad posture sets in.
Today I was doing some macro work with the 135 and an ext. tube. Zooming in 5x or 10x in live view was a shaky blurry mess. And if anyone mentions tripod, yes, I bring one everywhere and never use it.
No the 1/FL rule has nothing to do with MP numbers, it was arrived at by the measure of visual acuity and a 'standard' enlargement size/viewing distance combination, which was an 8"x10" print viewed at 12", or twice the size from twice the distance etc etc. What has changed is that we now enlarge things much more so movement is more visible, fullscreen on a 27" monitor viewed from a few inches is now standard, people taking pictures of birds think nothing of 100% enlargement ratios with an equivalent to 36" prints viewed from inches away.
Use of an extension tube greatly magnifies the enlargement ratio so 1/FL was never the "rule" when tubes were used.
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