I am using the Sony HDR-CX160 camera to test blender’s camera tracker. I am filming in 1080i/30fps. Interlace is all over the place. When I take photos, the exif data gives me focal length for each shot, whether I am zoom full out or full in.
What I want to know is how do I get the video’s focal length information. I use a formula to convert the sensor size to millimeters "(sensor mm width = 25.4 * manufactures sensor in fractions). In simpler terms: .25 * 25.4 = 6.35mm.
Here is the HDR-CX160 camera specs
The sensor size is 1/4" (4.5mm)
Focal length: 2.1mm - 63mm
Focal Length (35mm equivalent) : Movie Mode: 29.8mm - 894mm (16:9), 36.5mm - 1095mm (4:3); Photo Mode: 32.5mm - 975mm (16:9), 29.8mm - 894mm (4:3)
Aperture: f1.8- 3.4
Which focal length do I use with blenders tracker data when I am zoomed all the way out? Should it be 2.1 or 29.8?