The adventures of DrT

Documenting Chromatic Aberration in the Canon 10x30 IS Binoculars 

I spent a nice morning (9/22/2015) comparing binoculars :)

I clearly see the color fringing but I have a well-trained eye. I thought of asking my wife to look to see if she sees it. Finally, I thought “if I can see it, I can photograph it”. I set my camera and took a couple of pictures through the Canon IS 10x30 binoculars. Here are the results:

The left picture shows what my camera photographs with a 60mm focal length lens. This is the entire image vertically. Next to it is the picture that I took with the binoculars in front of the camera. You can see the blue color on the left side of the white pole. If you cannot see it very well, look at the second picture below which is an enlargement. The left side of the white pole is colored blue and maybe you can tell that the right side is a bit yellow.


The fact that you can read the phone number at the bottom (I was hand-holding the binoculars in front of the camera with the stabilization on) is really amazing.

I tested all my other binoculars too. They all show some degree of chromatic aberration only it is minimum (and hard to see) at the center and gets more pronounced as you move the image to the edge. With the Canon it seems that you can see it right at the center and does not get worse towards the edge. It bothers me that the amount of chromatic aberration in the Canons appears to be the same or worse than a $29 pair of binoculars (made by Meade).


Thank you for looking!