I would like to add the prop from Properties > Camera > Focal Length to a panel in the 3D View, but I can't seem to get it right.

class MyPanel(bpy.types.Panel) :
    bl_space_type = "VIEW_3D"
    bl_region_type = "UI"
    bl_label = "My Panel"

    def draw(self, context) :
        TheLayout = self.layout
        TheLayout.prop(context.space_data, "lens")  #Like this, but for the Camera's focal length.

The console suggests:


And this gives me the value of the function:


But how do I make a widget with this function in a 3D View panel?


1 Answer 1


I would recommend starting with the templates available. You need to import the blender python module & register your panel.

import bpy
from bpy.types import Panel

class MyPanel(Panel):
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'  # properties section 'n'
#    bl_region_type = 'TOOLS'  # tool bar section 't'
#    bl_category = "My Tab"  # add to specific tab
    bl_label = "My Panel"

    def draw(self, context):
        TheLayout = self.layout
        col = TheLayout.column(align=True)
        col.label(text="viewport lens")
        col.prop(context.space_data, "lens")
        col.prop(context.scene, "camera")
        col.prop(context.scene.camera.data, "lens")

def register():

def unregister():

if __name__ == "__main__":


  • Removed Loop of all objects to find multiple cameras.
  • Added scene camera prop for local selection in the event of multiple cameras


  • 2
    $\begingroup$ for obj in context.scene.objects may get slow in a big scene. Probably context.scene.camera is enough to draw the property. $\endgroup$
    – dr. Sybren
    Dec 10, 2017 at 9:35
  • $\begingroup$ Thank you @Ratt & dr. Sybren. I wonder how you got to (bpy.context.scene.camera.data, "lens") would work? Which it does! Googling it, this came up(for further reading): docs.blender.org/api/blender_python_api_2_77_0/… $\endgroup$
    – tintwotin
    Dec 10, 2017 at 12:07

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.