In the previous post, I compared the bokeh produced by the Olympus ZD 25mm f/2.8 prime to that rendered by the Canon EF 50mm f/1.4 when both lenses were used with the same depth of field, framing, perspective, and output size. Given that the ZD 25mm lens was used on an E-420 and the EF 50mm lens on a 5D, this meant stopping down the Canon by two stops relative to the Olympus in each case. In response to the post, I received a request to also share comparison images from the Canon lens used at f/1.4 and f/2.8. For equal perspective, framing, and magnification, these Canon f-numbers correspond to a more shallow depth of field than the Olympus can produce with this particular lens. While I don't think this test is as useful to those interested in understanding how the different lenses draw the same picture differently, it may be helpful in understanding the relative differences in depth of field between the two formats.

In each comparison below, the aperture used is indicated on the images. Click on each image to view at the intended viewing size, then use your browser "Back" button to return. Some browser/display combinations will require two clicks to get to the intended viewing size.


Here is the Canon at f/1.4 and f/2:

Both cameras at f/2.8:

Both at f/4:

Both at f/5.6:

Additional comparisons at matched f-numbers: