Unit scale affects camera focal length #42026

New Issue

Ejner Fergo · 2014-09-30T14:57:41+02:00

Ejner Fergo commented

2014-09-30 14:57:41 +02:00

System Information
OS: Linux 64bit / Win7 64bit
GFX: Nvidia

Blender Version
Broken: 2.67b - 2.72 RC1 eb464ee
Worked: 2.66a

Short description of error
I'm sorry to report this late, but just found out since I normally don't scale the units.
Scaling the unit (metric/imperial) by eg. 10, the camera focal length gets multiplies by this value. This is not how cameras/optics work, so what you see through the camera and what the focal length is set to, is wrong. The focal length should not change with the unit scale, since this affects eg. F/stop and camera export.

Exact steps for others to reproduce the error
No .blend attached since this is trivial to reproduce.

Open Blender
Select the camera, and in the data-tab see that the focal length is 35mm
In the scene-tab set units to metric, and set scale to 10
Go back to the camera data-tab, and see that the focal length is now 350mm. This should still be 35mm.
Manually setting the focal length to 35mm, and the perspective (looking through the camera) is wrong.

**System Information** OS: Linux 64bit / Win7 64bit GFX: Nvidia **Blender Version** Broken: 2.67b - 2.72 RC1 eb464ee Worked: 2.66a **Short description of error** I'm sorry to report this late, but just found out since I normally don't scale the units. Scaling the unit (metric/imperial) by eg. 10, the camera focal length gets multiplies by this value. This is not how cameras/optics work, so what you see through the camera and what the focal length is set to, is wrong. The focal length should not change with the unit scale, since this affects eg. F/stop and camera export. **Exact steps for others to reproduce the error** No .blend attached since this is trivial to reproduce. 1) Open Blender 2) Select the camera, and in the data-tab see that the focal length is 35mm 3) In the scene-tab set units to metric, and set scale to 10 4) Go back to the camera data-tab, and see that the focal length is now 350mm. This should still be 35mm. 5) Manually setting the focal length to 35mm, and the perspective (looking through the camera) is wrong.

Ejner Fergo commented

2014-09-30 14:57:41 +02:00

Changed status to: 'Open'