Look Through - should the view match the photo?

[maddin]

After aligning and processing a project, we can us the 'Look Through' function on photos to set the perspective view to that of the camera.

In my case, that view does not really match. The general direction in view content is somewhat ok, but the field of view, for example, is completely off. My images were taken with a 16mm lens on a full-frame DSLR, which results in a hFOV of about 97 degrees, but the perspective view uses the default 30 degrees.

Shouldn't the photo and the model view match closely when 'looking through' a well aligned camera?

[Alexey Pasumansky]

Hello maddin,

You can change the perspective angle while holding CTRL key and using mouse scroll in the Model view.

If the view is still off, it may indicate that the camera is not aligned correctly.

[maddin]

You can change the perspective angle while holding CTRL key and using mouse scroll in the Model view.
If the view is still off, it may indicate that the camera is not aligned correctly.

I am fairly sure the alignment is fine. All projected markers are exactly where they should be, error for this camera is 0.177 pix. But why should I change the perspective angle if 'Look Through' already knows precisely what the angle should be used to match the camera? I can use CTRL-wheel to set the angle to 90 degrees which is close to the 97 degrees my lens really has (assuming the number reported in the model view next to 'Perspective' is the horizontal field of view?!) and the view kind of matches but not really.

Attached are two screenshots: the photo and the view after 'Look Through' and manual adjusted of perspective angle to 90 degrees. As you can see, there is a lot more of the room visible to the right, for example.

[maddin]

You can try yourself using the doll tutorial, which contains a finished PS project, to see how the 3D view does not match the photo.

[jkova96]

Hello maddin,

You can change the perspective angle while holding CTRL key and using mouse scroll in the Model view.

If the view is still off, it may indicate that the camera is not aligned correctly.

Hi Alexey,
I'm thinking also about this topic...too...
Do you really know what's the relation between angle of view, in software, and camera "true" angle of view. I mean on angle of view which you can calculate manually and maybe find on manufacturer's webpages.

I have example with my drone, I calculated around cca. 80° angle of view, but when I scroll through perspective in Agisoft Metashape then it's best fit around 52°. So...Is there any relation between those values? Everything is well aligned, reprojection error is fine below 0,5 px...but...I just want to figure out which number i need to enter, or adjust to have equivalent view, same as picture. Thanks !

[Anton Terekhov]

Hi, jkova96
Did you calculate a vertical FOV or a horizontal one?

[jkova96]

Hi Anton,

Sorry for being late for answer on your question.
I calculate vertical Field of View, I mean angle that is measured from top to bottom of the screen. Don't know if you get same result.
I just want to have "official" what FOV uses Agisoft. There's NO or very little informations about that.
Hope you understand.

Best regards !

J.K.