What you see on a groundglass is basically what you get. If the image gets to dim stopped down, use a modest magnifier to check the details. But I'd suggest just
getting out in a garden or park on a relatively sunny bright day and just spending a lot of time looking through that groundglass with your lens of preference, and
getting accustomed to it at various distances and apertures, before unnecessarily burning a lot of film. I see zero use for depth of field calculators. They are just
an aid for hypothetical focus, which takes into account neither the effect of tilts and swings, nor how the image looks aesthetically, which is the whole point anyway.
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