This site has primarily been developed to relate to interactive 360° (spherical) panoramas.
An index to the 360° panoramas can be reached by clicking on the button to the left, which will take you to www.hugh360.co.uk, where there is information on creating panoramas and links to panorama related sites.
The Equirectangular Projection is usually the first step in creating the Spherical Panorama from the recorded images with software such as PTGui or Immersive Studio, so is readily available.
This projection is attributed to Marinus of Tyre in 100AD and has the property that meridians are equally spaced vertical lines and the circles of latitude are equally spaced horizontal lines making it ideal for measuring directions from the projection centre.
A property of the Equirectangular Projection is that the pixel separation can be directly interpreted as an angle and that the values are the same both vertically and horizontally.
To investigate whether a multi-lens camera would provide a 360° panorama of the same accuracy as a single lens camera rotated about its NNP (No Parallax Point) I set up fifteen random targets and used a sturdy Wild (Leica Geosystems) tripod with a forced centering Tribrach to ensure that all three sets of equipment I was using would have exactly the same vertical axis of rotation.
To provide the “bench mark” angles I first measured all the targets with a Kern DKM2-A 1” Theodolite.
To provide an example of using a fisheye lens on a DSLR I used a 10.5mm and 8mm lens mounted on a Nodal Ninja R1 and took a set of 4 shots round and 6 shots round with each lens. These were stitched with PTGui.
I then took eight panoramas with a Samsung Gear 360 duel-lens camera mounted on a Nodal Ninja NN3, each set at 45° to the previous one. These were joined using Gear 360 ActionDirector.