Aperture or F-Stop?

[pigsy1024]

So I think I finally have it figured... As someone who digs shallow DOF in my shots, the 'Aperture' had me stumped for a while, I was missing the old Lightwave 'Lens F-Stop' and assumed that 'Aperture' was just a number that, the higher you plugged in, the blurrier it was.

I should have realised Juanjo was smarter than that.

Remembering that, on a real world lens, a stop of 1.3 or 16 or whatever, is ACTUALLY 1/1.3 or 1/16, I tried plugging in a little scalar divide node to link the f-stop to the Aperture. Basically dividing the number 1 by the f-stop value and feeding that into 'aperture' , and lo and behold, we actually have a photographically correct camera again! (well, we always had it, I just didnt realise how to get it.)

I've attached a little jpg of the node link-up, pretty simple.

Of course if everyone else had this figured out from day one, and I'm just late to the party, feel free to ignore and/or ridicule me.

[Aww167]

Very grateful for your explanation and the diagram. As a new user I need all the help I can get. Thanks.

[3dreamstudios]

Don't forget the DOF can be greatly affected by the Focus Length as well. I seem to remember someone posting a method of linking a NULL and finding the distance from camera and then plugging that into the appropriate input.

That also gives you an animated Rack Focus type feature!

Thanks for the diagram.

[CANDITO]

Thanks a lot,

didn't know you could use these nodes in the Octane process (like divide or multiply)