Where to compare dof between the 6D and 1D4?

Great Bustard wrote:

Maybe this will help:

http://www.josephjamesphotography.com/equivalence/index.htm#introduction

A 50mm f/2 lens is a 50mm f/2 lens regardless of the sensor that sits behind it. However, the effect of 50mm f/2, in terms of the visual properties of the recorded photo, depend very much on the sensor that sits behind the lens:

50mm f/2 on 4/3 (mFT) is equivalent to 62.5mm f/2.5 on 1.6x (Canon APS-C), 67mm f/2.7 on 1.5x (APS-C for everyone else), and 100mm f/4 on FF (FX), where "equivalent to" means:

• The photos all have the same AOV (diagonal angle of view) and aperture (entrance pupil) diameter: 50mm / 2 = 62.5mm / 2.5 = 67mm / 2.7 = 100mm / 4 = 25mm.

• The photos all have the same DOF (as well as diffraction softening) when they have same perspective (subject-camera distance), AOV, aperture diameter, and display size.

• The photos all have the same motion blur and the same total amount of light falls on the sensor when the aperture diameter and shutter speed are the same (e.g. ISO 100 on mFT, ISO 160 on APS-C, and ISO 400 on FF).

• The photos all have the same same noise when the same total amount of light falls on the sensor if the sensors are equally efficient (less noise if the sensor is more efficient, more noise if the sensor is less efficient).

• Other elements of IQ, such as resolution, bokeh, flare resistance, etc., as well as elements of operation, such as AF speed/accuracy, size, weight, etc., are not covered in this use of the term "equivalent".