Camera focal length

[dag]

I'm assuming the focal length (lens_sensor_dist) is calculated on export to match the camera in blender, which is wrong?
Wouldn't it be better, if possible, to switch the blender FL field with a custom blendigo one that does the conversion after you enter a value, instead of at export, so we know what FL we get in indigo, which is correct?
For example if I had 50mm entered in blender, then switched to indigo renderer engine, the FL field would change to 56.25000226875821 .
Just take a 100mm lens. That's 18.181 degrees FoV in blender, but it's actually 20.4.

[neepneep]

I really need help with matching some Blender renders to Indigo renders and at the moment the focal length is giving me so much grief and hassle.

Is there an easy way to match it directly?

[neepneep]

See attached image for example.

The overlaid lines shows how the Blender camera appears compared to Indigo. Pretty much a showstopper

[dag]

Looks like the blender camera needs an overhaul as it's not matching real world optics.
Try using lens degrees instead of length, since that seems more correct, but that would probably not work either.

[dougal2]

Thanks for letting me know, I'll do some testing here and check the formulae.

[OnoSendai]

Indigo is probably displaying an incorrect focal length. We will have a closer look at this and fix it soon.

[dag]

Indigo is 100% correct according to http://www.tawbaware.com/maxlyons/calc.htm
Blender is funky.

[OnoSendai]

What Indigo prints out in the GUI (in the focal length spinbox) is not actually the focal length, but the lens-sensor distance. The two are equal only when the focus distance is set to infinity.