Instruction manual

Instruction Manual Roundshot D3 - version 4.05 – May 2013 - © by Seitz Phototechnik AG / Switzerland www.roundshot.ch page 64
4.5 … select the image format
In rotational 360° panoramic photography the image format is defined by three factors:
• the image height (sensor resolution in pixels vertically)
• the image length (degrees of rotation horizontally)
• the effective focal length of the lens used
The image height for the Seitz D3 Digital Scan Back is 7‘500 pixels. This vertical
resolution does not change regardless the lens used*. The vertical resolution of the
final image can be further increased by scanning the scene twice while shifting the
back up/down (for static scenes only). With this 50mm shift a maximum vertical
resolution of 13‘750 (7‘500 + 6‘250) pixels can be achieved.
The image length can be defined in the software in degrees, from 1° to 999°. With a
given image length and a given effective focal length, the software calculates the
number of steps required to complete the image:
Image length =
f* 2 *
∏ * deg
360 * pitch
where: f = effective focal length
∏ = 3.14159265
deg = degrees of rotation (image length)
pitch = size of one pixel;
for D3 = 8 µ or 0.008mm
For example:
The image length for a 360° panorama taken with the Roundshot D3 and a 35mm
lens is:
35 x 2 x 3.14159265 x 360 / 360 / 0.008 = 27‘489 pixels
… and with an 80mm lens:
80 x 2 x 3.14159265 x 360 / 360 / 0.008 = 62‘832 pixels
* For medium format lenses; small format lenses have less vertical resolution