Frame Width and Focal Length?

z5267a_31296499a3

Forgive me if this has been covered before but the feature that confuses me doesn't seem to be in the manual. (daz_studio_4_x_user_guide)

My question is this: What is the functional difference between "Frame Width" and "Focal Length" on the camera? They both seem to zoom in and out. Originally, I thought Focal Length would "stretch or compress" the view while "Frame Width" would not...but that doesn't seem to be the case. The perspective seems to me to be the same using either one.

The manual doesn't even have "Frame Width" listed, going straight from "Perspective" to "Focal Length".

I would appreciate any info I can get on this.

Thanks

dijitul

It's a good question.  I never tested it myself, but logically you'd think the Focal Length would adjust the Field of View and Depth of Field but the Frame Width would only adjust the Field of View.  Not sure if that's really the end result, though.  

Fishtales

Frame Width is a camera setting for the size of sensor on cameras. 36mm, the default is the size of a sensor on a 35mm format camera and 60mm is the size of a medium format camera. The size of the frame increases the amount of area that enters the lens onto the sensor/film. In film the size of the frame corresponded to the size of the film. Focal length is the size of the lens that is in front of the film. 55/65 mm is a normal lens, anything lower is classed as a wide angle lens and anything higher is a zoom lens. Setting the frame size just lets more of the scene into the camera, zoom works the same on any frame size.

nonesuch00

I think they adjust the depth (length) and rectangle (width) for your depth of field blur effect. Everything in the volume created by those is in focus and outside the volume is blurred. I think?