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Old Apr 30, 2009, 12:48 AM   #1
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At 50mm, my Minolta 24-105mm is sharper than the prime Minolta 50mm F1.7. Shouldn't the prime lens be sharper than zoom lenses?

All pictures were taken at the same time with tripod with F8 and 2 sec timer.

100% crop from the center.

From left to right in this order: (1) Sony1870 (2) Minolta50mm prime (3) Minolta24105


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Old Apr 30, 2009, 7:25 AM   #2
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The first thing I noticed is that the 18-70 is clearly inferior to the other two, which is no surprise.

The second thing I noticed is that the image from the 50mm is brighter than the image from the 24-105. When I adjusted the brightness of the thirdimage so that it closely matched the second, I saw what I think is more contrast in the third, though I don't think it was any sharper.

The lastthing I noticed is that the image from the 24-105 has a little more chromatic aberration than the image from the 50, though that's really picking nits.
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Old May 20, 2009, 9:27 PM   #3
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Minolta 24-105 gets soft by 105mm (much softer than the beercan at 100mm). At 70mm it's about as sharp as beercan in good lightning. Like beercan, it also suffers from CA (especially at 105mm).
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