How to calculate depth of field at different resolutions

Question

I have a DSLR (EOS 60D) and I use hyperfocal pro when setting up astro-photography.
At lower resolutions though, such as in video mode, how can I calculate the depth of field?
The field of view barely changes so there is not much crop, but there is no continuous auto-focus so I want to keep the subject in focus.
Is the DOF the same as in photography modes, assuming the same aperture and focal distance?
And if it isn't, is there a similar app or calculator for the lower resolutions?

Steven Kersting · Answer

Depth of field does not vary by resolution; assuming you meet the minimum requirement (~ 1MP).
Depth of field does vary by sensor size though; because a smaller sensor will require more magnification/enlargement, which makes a lack of sharpness more apparent.
Depth of field is the same for video as it is for still images. You can use any of many  calculators available assuming the viewing conditions will be standard and no cropping will be applied. If the viewing conditions are not standard, or the images/footage will be cropped, then the default results of a DoF calculator will be wrong; you would need to use a different CoC limit suitable for the output/viewing conditions.

How to calculate depth of field at different resolutions

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