Dwayne Kellum

Dwayne Kellum’s video “High Altitude Balloon 24 (I_See_Stars!)” shows the curve of the horizon.  This is visible when the horizon is both above and below the center of the frame.

The camera is a Sony A7s II.  The Lens is a Sony FE 50mm F1.8.

This lens is very rectilinear.  Here is the quantification of the rectilinear properties:


This grid shows the non-fish nature of this lens. A fish-eye lens or one with strong barrel distortion causes straight lines to curve.  This lens does not have such a problem.  It does not matter if a line is above or below the center of frame.  There is not induced curve from the lens.

Screen Shot 2020-06-13 at 3.38.53 PM

Here is a screenshot from Dwayne’s video  at 117,431 feet, the yellow line is added to see the curve:

Dwayne-24 with line

Here is the same screenshot compressed to 10%:

Dwayne-24 compressed