Here is a mini-review comparing the 7D to the 1D3. I have had both for extensive periods through the course of the last several years. I thought it would be good to compare noise, fov differences between 1.3 and 1.6, and then resizing the 1D3 up to the 7D sizes to see if one could use the 1D3 fairly interchangeably with a 7D.
Here is the gallery of images used to do the comparisons
I used 2 of my L lenses, the 24-70L (just back from a fix and calibration visit at Canon), and my 70-200 f2.8 IS. I shot in raw, and the only thing I changed after the fact was to set all pics to the same WB value. I used DPP to convert. If I ever run any actions, I run the same set on each. I ran the same exposure settings on each as well for each test.
- For the ISO tests, I ran 800 through 6400 on a pretty low natural light scene and changed my focal length to try to keep the same FOV to help minimize the differences in crop values.
- For the Exposure test, I ran a test shot on each body at ISO 3200 underexposed by 2 stops, then brought them up to see how "flexible" either was to underexposure. I also changed the focal length to try to make up for both the FOV difference and the resolution difference as best I could, so that I could have the number of pixels on target for each image.
- For the resolution test, I took a shot at 200mm on both bodies, and tried to equalize the 1D3 image crop to be the same as the 7D, by cropping each accordingly, then resizing the 1D3 up to the 7D.
My summary after the tests:
- The 7D seems to match up with the 1D3 quite well in regards to ISO management, neither really seems to have an edge on the other in general shooting, especially when you resize the 1D3 up
- The 1D3, even though in some situations, shows more noise, but it also seems to retain some more detail through the noise
- The 1D3 cropped and resized images are pretty close to the 7D, just a tad less sharp overall, but if you can rest assured that you do have the ability to resize the 1D3 up and get reasonably the same IQ as the 7D
- This means the 1D3 takes more post processing to get the same sized results as the 7D, so in many cases, it may just be more efficient to shoot with the 7D
- The 1D3 focuses better in low light
- The 1D3 frame rate doesn't slow down in questionable light like the 7D
- The images on the 1D3 look worse on the rear LCD but better on the computer (due to both the old lcd design and the old small thumbnail JPG in the raw), and the 7D looks better on the rear LCD but worse on the computer
Resolution test follows...