RedPhantom posted at 9:30 PM Tue, 2 May 2023 - #4464078

A question about using DOF. I can set the focus distance with out problem but how do you figure the fstop? 2.9 doesn’t tell me much. 

There are formulae that can help calculate the "shape" of the DOF bubble that might help until you have a more intuitive feel for it, which I gather comes with the practice I haven't done.

The main problem from a Poser standpoint is that one of the things that affects depth of field, to my surprise, is the size of the sensor.  This is something we don't really know in Poser.  We should probably ask the programmers what size sensor they are simulating.  Still, putting different variables in to the calculator (leaving sensor size entirely alone) might give you a feel for how they interact that might be useful to you anyway.  Using a search term of "calculating depth of field", I found a couple for you.  One apparently has a database of sensor sizes based on manufacturer and model number, the other wants an explicit size.  Since you'll be trying to get a feel for DOF rather than specifically using the calculators for a perfect solution, the sensor size is a little less important this time.  (We really should find out, if we can, though. I'd like to see that datum added to the manual in the DOF section for those people, especially newbies, who WANT to use a calculator for a perfect solution.)

https://www.omnicalculator.com/other/depth-of-field  This is an article on the subject with the calculator added to the article.

https://www.photopills.com/calculators/dof  This is just a calculator.  The first one might be more useful for those of us who are not photographers.

Hope it helps.  Best of luck!