Is my copy soft or that's the average for the Canon EF 70-300 f/4-5.6 IS USM?
- By Bruce 101
- Canon Lenses
- 35 Replies
Sporgon said:Very briefly and talking FF: it should be very good across the frame when stopped down a little from 70 to about 120.
From 200 to 300 it should sharp in the very centre stopped down 2. But the mid frame will be soft. Don't even look in the corners.
It's overall performance is much more suited to crop sensors.
I agree with most (maybe all!) of this.
But, the non-L 70-300 seems to perform best on a full frame @300mm if the center is your primary concern. If you believe the TDP charts. Otherwise, it's better on a crop.
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=358&Camera=453&Sample=0&FLI=4&API=3&LensComp=358&CameraComp=736&SampleComp=0&FLIComp=4&APIComp=3
FWIW, I have found the non-L 70-300 to perform better - particularly @300mm - on the Sl-1 than it does on the 60D.
I too am really wondering about the accuracy of the TDP charts as to the L version of the 70-300. If you do a comparison of the L version to the non-L verson in the center @300mm, the difference is noticeable but not huge. Of course, across the frame, there is no comparison - even at f/8:
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=358&Camera=453&Sample=0&FLI=4&API=3&LensComp=738&CameraComp=453&SampleComp=0&FLIComp=4&APIComp=3
And at f/11, (I know, I know, who uses f/11 on these lenses...) the L and the non-L appear equally sharp in the center on full frame:
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=358&Camera=453&Sample=0&FLI=4&API=4&LensComp=738&CameraComp=453&SampleComp=0&FLIComp=4&APIComp=4
If you are using the non-L 70-300, you just need to know its limitations to get the best bang out of it. But it is possible to get sharp images from it all the way to 300mm.
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