Need help translating 35mm knowledge to my PowerShot G15

Started Oct 10, 2012 | Questions thread
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Re: Need help translating 35mm knowledge to my PowerShot G15
In reply to Gary Fischman, Oct 10, 2012

On reading the title of your message, I suspected it to be largely about depth of field.  Perhaps this DOF calculator will help:

Your G15 only goes to f8 because the hole (aperture) is already very small for that focal length (function of sensor size).   Diffraction becomes a problem with smaller holes -- already somewhat a problem at f8.

Incorrect (and others will jump in to be more precise) but, with my G12, I think in terms of the f8 being more like f22 for 35mm; that is,  add three stops (some say 4 or 5).  This simple thought process is useful to me and saves me from checking the real DOF.  Besides, DOF is very debatable anyway (ducks for cover as this message thread is now guaranteed to max out).

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