Resolution comparision 40D vs 50D vs 7D


The target is  a Canadian 20 dollar bill taped to a wall . Cameras 40D, 50D and 7D were all used to shoot the target with with 300mm f2.8L IS (IS off) lens at f8 distance 2.58 meters, bounce flash manual power. Shutter 1\250.
 

I shot several images with each camera using live view  to manually focus . There is were slight focus variations due to the difficuly of manuaallt focusing the 300 f2.8 so only the sharpest frame was selected from each camer for comparison.

The 40D and 50D images were processed with a  Breezebrowser conversion from RAW to TIF and the 7D was converted with DPP (both use Canon conversion engines). No sharpening or noise reduction was used. Picture style was set to Standard, 8bit TIF, adobeRBG.

Corel Paint Shop Pro Smart resize method was used to resize the 40D and 50D images to 5184 pixels long side to match the resolution of the 7D. No sharpening or noise reduction was used.

The side by side  comparison is at actual pixels. The image show here is a JPG with low compression.

These results are representataive of what  I have found with past testing.
 
 








Test target


 
 
 
 
 
 
 
 

Actual pixels normalized from the above target crop




 
 

Conclusion:
The 7D has slightly more resolution than the other two cameras.  During the test it was clear that slight focusing differences from frame to frame can easily influence the results.
 
 

Comments;

1 - The same test pro

 
 
 
 
 
 

Return to Index