Is there somewhare I can set focal length in SU views?

CalypsoArt

I have not played much with the cameras in SU. I've found where I can change the cameras, i.e. 16:9, 4:3 etc. However, when I choose 16:9, am I not just changing the format, but lens focal length is something else. what is the standard focal length looking through a camera in SU. How can I set 18mm, 28, etc?

Dave R

Select the Zoom tool. The VCB will probably display an angle of view in degrees. You can change it to a focal length by typing mm after the number you enter.

Roger

Focal Length (mm)
_13 | __|15 | _18 | __21 | __24 | __28 | _35 | _43.3 | _50 | __70 | __85 | _105 | _135 | _180 | _200 | _300
Diagonal (°)
118 | _111 | 100 | 91.7 | 84.1 | 75.4 | 63.4 | 53.1 | 46.8 | 34.4 | 28.6 | 23.3 | 18.2 | _13.7 | 12.4 | 8.25
Vertical (°)
85.4 | 77.3 | 67.4 | 59.5 | 53.1 | 46.4 | 37.8 | 31.0 | 27.0 | 19.5 | 16.1 | 13.0 | 10.2 | 7.63 | 6.87 | 4.58
Horizontal (°)
108 |100.4 | 90.0 | 81.2 | 73.7 | 65.5 | 54.4 | 45.1 | 39.6 | 28.8 | 23.9 | 19.5 | 15.2 | 11.4 | 10.3 | 6.87

I may have to do a bit of editing on this comment. Right now the dog wants walked.

The "normal" focal length of a 35mm or full frame sensor DSLR is around 55mm. (this is what SU uses)
Most DSLRs are less than full frame and normal for them is a 35mm lens.
I just found out that you can enter either degrees or mm in the SU dialog box for FOV (Field of View). If you enter a number followed by mm you get the equivalent lens. So if you want normal, type in "55mm" which is roughly the equivalent of "35 deg"
To further complicate the issue, the camera sees in an instant from one direction and the brain sees over time in multiple directions. The problem is with two eyes and peripheral vision and our heads lock firmly forward we see about 180 degrees horizontally. However, most of what we see is a total blur which gives us more info about movement than shape. We only see shape in about a 90 degree horz cone of vision. But that is with two eyes and the camera only has one. So we see pretty well in a 35 - 45 degree cone of vision. Still that is not a critically sharp cone of vision. For a sharp cone of vision we can only see about 12 - 15 degrees if we didn't cheat. How do we cheat? Four ways; we move our position, we move our heads and we move our eyes over time and our brain saves the sharp parts and stitches them together in our perception. But that is three ways and I said four. What is the fourth way ? We also refocus our eyes when looking at objects close to us and that too feeds into perception. So all is an illusion and our fourth dimensional reality fits comfortably with the illusion produced by a 55mm lens on a 35 mm film camera or a full frame sensor digital SLR.

AS I have pointed out before in other posts choice of lens has no effect on perspective. Perspective is a product of distance from camera to subject. The two major effects of lens are the size of the main subject and the relative size of foreground and background objects.

pilou

And if you want some infos of 180°, 360° images go to there From Paris.com
a crazzy site made by a French guy but it's in English!