Cheers Wolf, but unless it falls outside of the screen-shot, I see no Anamorphic control there. If I recall it is labelled "Aspect" under the Depth Tab in the Aperture section. You understand what DOF is, but I recommend you look into Anamorphic DOF (especially as you're into producing stuff) cause it's a very different thing. If you go into Cycles mode you will notice that DOF Aspect setting I mentioned, and that setting is vital, because it allows you to set an aspect ratio for the bokeh independently of the frame.

In other words, it gives you an Anamorphic lens for use in your renders, movies, animations.

If you've ever looked at the spec of a movie written on the back of a DVD or Blu-ray cover for example, you will often see terms such as "Anamorphic Widescreen" and a number after it such as "2.35:1", meaning the film was shot through a real anamorphic lens.

That number is the aspect ratio of the lens they used, and the important thing to understand is that these are very special lenses, they behave differently to standard lenses. It results in the out of focus elements of the scene being blurred in one direction more than the other, and depending on the aspect ratio of the lens, the result could be mild or very noticeable. This is what makes cinema look the way it does, and why people using standard lenses often scratch their heads thinking, how come my stuff never looks cinematic?

Anamorphic is the true look of cinema, mainly because big budget movies are generally the only time they are used, and therefore generally the only time you are ever subjected to the look of a real anamorphic footage. Likely 99.9% of movie-goers out there know the look, they know something is different, but cannot put their finger on what it is.

Well that's what it is, it's the out of focus elements being stretched vertically that is giving the look.

In order to achieve this in Blender and Poser, you need an aspect ratio control for the DOF that is independent of the aspect ratio of the camera frame. You'll notice that you DO have this control in Cycles mode (and Superfly mode in Poser), but it get's completely ignored by people because they have no clue what it is for, or what importance it has in making stuff look cinematic, yet it is the most powerful way to get a cinematic look than anything you could ever wish for. Set that DOF aspect control so that it is twice as high as it is wide, and you have yourself a lovely Anamorphic lens with a 2x ratio to capture your scene!

Watch this little clip and keep your eyes on the TV screen as it goes in and out of focus. You will notice that unlike standard bokeh, the Anamorphic bokeh gets stretched vertically, and you'll also notice that despite this is someone playing around at home, it looks INCREDIBLY cinematic ... well ... that anamorphic bokeh is the magic ingredient!

WATCH THIS CLIP

Just in case you're curious, here's what an Anamorphic lens looks like, notice anything odd about it? That's a 2x aspect lens, so your defocus will look pretty much twice as high as it is wide. To get that type of lens in Blender or Poser, set DOF aspect to 2x to give your movie the true look of anamorphic cinema!