Distace from Camera to object in drawing.
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@tig said:
As I understand it... the bigger the f-stop number the greater the depth of field about the focal-depth.
So a large number uses a 'pinhole' which has almost everything focused about that point, but a small number uses a 'wide-eyed' aperture which focuses on the point,[the following is really nothing to do with the conversation but you're
y so you might appreciate the tidbit 
]f-stops, which are generally written f/4 etc, means (f)ocal length ÷ aperture stop
so using a 100mm lens at f/4-- the f/4 tells you the physical size of the aperture opening for the lens/stop combo..
(100mm / 4 = 25mm... so the aperture is 25mm in diameter... same lens at f/11 = 9mm aperture opening.. etcetc..)
ie- your understanding about larger fnumbers = smaller apertures is correct.. the above is just an attempt at grasping the why..
EDIt.. oh.. and to see these maths in action.. (ha)
earlier in the thread, I said you'd need a 400 f/1 lens to do that... so that lens would need to have a 400 mm hole in it.. the glass & housing need to be bigger than that so we're looking at a lens approaching 2' across -
When you disable physical camera, the "Aperture" box become available (under SettingsCameraDOF/Basic Params).In this case, you control the DOF effect with this option.
"A small aperture will have a only a slight amount of
blurriness for objects which are not within the focal distance. A large aperture will have a large amount of
blurriness for objects outside the focal distance."
There was the place where I had the value of 0,4 ,and not the f-stop like I said in my first comment. The problem is that I tried to recreate the same effect without physical camera, and it's not working. Must be a bug, because I had values between 0,001 and 500, without any changes for DOF effect.
So, I'll guess you'll have to use physical camera when you want DOF.
Cheers,
Stefan -
@stefanq said:
There was the place where I had the value of 0,4 ,and not the f-stop like I said in my first comment. The problem is that I tried to recreate the same effect without physical camera, and it's not working. Must be a bug, because I had values between 0,001 and 500, without any changes for DOF effect.
like i said earlier, you'll have to get closer ...
it's practically impossible to stand 50' away from a subject and expect to get shallow dof.. regardless of camera settings..
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