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Canon 24-70 f/2.8 II softer than 24-105 f/4

Started Oct 16, 2014 | Questions thread
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Colinbrowne New Member • Posts: 4
Canon 24-70 f/2.8 II softer than 24-105 f/4

I just paid a fortune for the 24-70 2.8 II as an upgrade to the 24-105, but after testing and testing I'm finding that the 24-105 is sharper. How is this possible? I've attached comparison pictures, both taken on 5DIII at ISO 5000, f4, 1/100th. This is a crop from 100%, dead centre of the frame, straight out of camera. I took them about 30 seconds apart and found that the 24-105 is sharper throughout the zoom range. Have I just got a bad copy?

 Colinbrowne's gear list:Colinbrowne's gear list
Canon EOS 5D Mark II Canon EOS 5D Mark III Canon EF 35mm F1.4L USM Canon EF 50mm F1.4 USM Canon EF 85mm F1.8 USM +3 more
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