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1Ds3/7D quick detail check

  |   Articles and reviews, Camera testing, Canon 1Ds mk3, Canon 7D, Lens, Review, Rumour camera test   |   5 Comments


 

How sharp are the images from the Canon EOS 7D? I believe there has been some discussion on the matter ;-)

It was suggested (thanks) I take some shots at f/6.3 with the 7D and 1Ds3.

Taking both cameras outside, I picked one of my sharper lenses…

Two views across the street Canon 1Ds3 and Canon 7D

Two views across the street Canon 1Ds3 and Canon 7D

Here are some 100% crops, processed in ACR with no sharpening

Taken with a TS-E90 lens of the view outside of my house, cable release, manually focused with LV x10 ISO100 AV mode

100% crop 1Ds3

100% crop 1Ds3

… and the 7D

7D 100% crop

7D 100% crop

Then I magnified the 1Ds3 image (PS Bicubic smoother) to match the scale of the 7D image.

1Ds3 magnified to match 100% crop of 7D

1Ds3 magnified to match 100% crop of 7D

Of course normally you need to apply some sharpening to any RAW image.

7D image at 100% (sharpened)

7D image at 100% (sharpened)

and finally the scaled 1Ds3 image, sharpened

Sharpened magnified 1Ds3 file

Sharpened magnified 1Ds3 file

Just a quick test, but it confirms what I’d expect – the 7D sensor out-resolves the 1Ds3 sensor with the same lens, it just includes less of the scene.

I’ve made no attempt at optimal sharpening of any image, but it’s enough to show (to my own satisfaction) that the 7D 18MP crop frame sensor  out-resolves the full frame 1Ds3 21MP sensor with a good lens at f/6.3.

When you consider that the equivalent full frame sensor at 7D density is ~45MP, I’m not exactly astounded at the results :-)  Another way of looking at it is that the 1Ds3 is equivalent to under 9MP at 1.6 crop.

Of course this completely ignores the field of view difference. If I used two good lenses at the appropriate focal lengths to match fields of view, then I’d expect the 21MP sensor to provide more detail than the 18MP one. Once you start comparing this though, you are changing a lot more variables…

Note that I’m using the centre of the frame of a good sharp lens – that old kit zoom you saved from the 300D might not be nearly as good as you thought.

As ever YMMV, but I’ve no problem with 7D image sharpness…

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