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#41
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Canon finally makes an *f4* 70-200 IS...
"Bill" wrote in message
... The thin black line is wide open at 30lpm, which shows fine detail resolving power or sharpness. It's only 65%, not very good at all. It shows an odd hump beyond 15mm but that doesn't really matter. The "odd hump" beyond 15mm is what allows the 70-300 to be sharper than the 70-200 at that part of the frame in that condition. The 70-200 gets softer toward the edge while the 70-300 gets sharper. Obviously the 70-200 is the overall better lens, but it isn't sharper at every part of the frame both radially and tangentally. The 70-300 has the odd characteristic of getting sharper when wide open toward the frame edge. I was merely pointing out that you can construct a test where the 70-300 will score better than the 70-200 since the 70-200 doesn't have better mtf at all positions. |
#42
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Canon finally makes an *f4* 70-200 IS...
"Wolfgang Weisselberg" wrote in message
... Be aware that Canon's MTF charts are computed, not measured. I didn't know this. I presumed that they either measured one sample, or averaged a whole bunch of samples. |
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