Aperture Size and Fnumber

[condar]

Considering that Aperture Size and F-number are related by

Aperture Size = Lens (mm)/ (2*1000(fnumber))

I made some examples with the same scene but with a fixed focus distance (30 m) and different lens (35 mm, 50 mm, 100 mm and 200 mm) and F/number values

[bupla]

Interesting tests, especially the one withe 100mm lens.
Because in reality, with a 35mm or 50mm lens, you couldn't have such a shallow DoF with a correct scaled chair.
The bokeh effect on the last image is great, which Bokeh type are you using, disk1?

Do you know if the lens of the Yafaray camera is physically correct? (Blender's are not).

[condar]

Interesting tests, especially the one withe 100mm lens.
Because in reality, with a 35mm or 50mm lens, you couldn't have such a shallow DoF with a correct scaled chair.

yes.... I was completely wrong. That´s why I´ve updated the images and the values.

The correct value is

Aperture Size = Lens (mm)/ (2*1000*fnumber)

The bokeh effect on the last image is great, which Bokeh type are you using, disk1?
.

yes... disk1

Do you know if the lens of the Yafaray camera is physically correct? (Blender's are not).

I changed the lens value from Blender Panel and it´s apparently correct for a 32mmx24mm film width. For any other value you need to do some corrections. You can try this script for Blender

http://home.metrocast.net/~chipartist/B ... index.html