Rhino Camera lens length changes brightness of rendering

[preppen]

Changing the Rhino Camera "Lens Length" changes the brightness (exposure) of the rendered image. Is it supposed to work like this or is this a bug?

[preppen]

After a bit of more testing it seems that Vray's "Deapth of Field" settings are somehow involved in this even though they are disabled.
Changing the DoF "Focus Distance" setting and then disabling DoF still affects the rendering...

[fpedrogo]

Hello
The problem is happening when the focus point of the camera gets very close to the camera position. This is more common in scenes where small objects (jewelry) are looked at.
A possible solution could be changing the units (not mm) without scaling then the brightness stays the same between renders.

This behavior it is "physically correct" from a mathematical stand point, but should not be happening in the CG world. We are looking for a real solution to this behavior.

[preppen]

It might be "physically correct", but the setting is still DISABLED, so why is it affecting my scene..?
Is this why the brightness changes when changing Lens Length? This did not happen in Vray2. We use Named Views with different Lens Lengths to do overnight batch renders, and this does not work anymore without rendering every Named View we changed and then starting to fiddle with EV settings on everything that does not have Lens Length 50.

And if a focus point of 200mm is whats causing the problems, even though the setting is disabled, why is it set to that as standard....?

[Micha]

And if a focus point of 200mm is whats causing the problems, even though the setting is disabled, why is it set to that as standard....?

I see at your screenshot no option to enable to use the focus point by camera. How did you try to disable the fixed length? It's so important for batch and animation renderings.

[fpedrogo]

It might be "physically correct", but the setting is still DISABLED, so why is it affecting my scene..?

I agree with you and I mentioned that in my reply. This is not the desired result and we are looking for a solution to this issue.

[Travis Serio_cg]

This is definitely a big issue for jewelry. The other thing I've noticed is that materials with environment overrides have issues related to the camera as well. Some objects will be super bright and others are dark even if using the same map and same multipliers. It's a hot mess....

[Peter.Chaushev]

The dev team is looking into the DoF-Exposure issue.
As for the Material Env. override multipliers - could you please provide a simple scene demonstrating the issue?

Kind regards,
Peter

[Travis Serio_cg]

It appears the majority of the issue is the DOF-Exposure issue as well as Dome Light not appearing in per object exclusions. When ignore objects in secondary is selected in the materials options menu all Dome Light reflection info is dropped. This should be considered a bug.