1) Download zipped upgrade
2) Download zipped help
3) Remove old version of vob.exe from VOB folders of your computer (Before it we recommend to zip the old version of VOB for storage)
4) Remove old version of VOB Help
5) Unzip new version of "vob.exe" to your VOB folder
6) Read "ReadMe First" file before running VOB
7) Unzip new version of VOB help to your VOB help folder How to install VOB trial: 1) Download zipped VOB trial 2) Unzip VOB trial 3) Read "ReadMe First" file before running VOB 4) Download zipped help 5) Unzip VOB help to VOB directory 6) Use samples of the optical systems (files with .os extension) These files are supplied with VOB trial in the OS folder

1) Download zipped VOB trial
2) Unzip VOB trial
3) Read "ReadMe First" file before running VOB
4) Download zipped help
5) Unzip VOB help to VOB directory
6) Use samples of the optical systems (files with .os extension) These files are supplied with VOB trial in the OS folder

Edit as Table option (Properties window) is the main VOB tool.
Properties window is automatically opened by VOB if the New system is selected (File menu option).
To set parameters of the optical system use the following folders of the Property window:
Object, Surfaces, Aspherical, Lens Array, HOE, Spectral.
To finalize the entry of the set optical parametrs press the Apply button. It has to be done separately for each folder.
To show raytrace click the Real rays button in the Tool box.
Click Actual Size (right-hand) button of the Zoom Box to display a 2D image of optical system after editing.

Minimum optical system consists of three surfaces (single mirror).
Single lens has four surfaces.
The first surface is always the Object plane (surface).
The diameter of object plane (Dext) needs to be determined even if the object is located in infinity. As a rule the Radius parameter is set to Infinity, Glass parameter is set to 1. (Edit as table)
The last surface is always the Image plane (surface).
Radius parameter is usually set to Infinity and Glass parameter is set to 1.
Diameters (Dext) of all surfaces must be entered.
To set plane surfaces type Infinite or 0 in the Radius column (Properties window, Surfaces folder).
Index of refraction between two surfaces is defined at the first surface.
The sign of a spherical surface is + if the center of the surface curvature is located to the right from the surface, it is - if the center of the curvature is located to the left from the surface.

Values of the Thickness parameter are always positive.
All Thickness parameters have to be determined, including the distance from the last optical surface to the image plane. If this distance is not known, you may define it as any value. Then use Plane of Best Installation option from Tools menu option.
To set a mirror surface type in "Refl" in the Glass column (Surfaces folder).
Since the Thickness values are always positive, entering of Refl parameter changes the signs of refractive indexes for surfaces following the reflective surface. The sign of refractive index after odd number of beam reflections is "-". After even number of beam reflections the sign is "+". Signs of refractive indexes are changed by VOB automatically.

If the object is placed at a finite distance then for the Object and first surface enter the following:
Dext (Surface folder) = 2 x object height (Object folder, Object Coordinates).
Use the Tool box to get a quick access to calculations and display controls

If VOB windows are open you can get Help information about parameters and features of the open window. Click the Help button of the open window. It may be done for almost all windows.

Alternatively you can use the Help button in the horizontal bar menu of the main VOB window.

For most optical systems it is useful to set Dext of the first and the last surfaces greater than the maximum diameter of optical surface in the system.

Use the right mouse button to control the properties of displayed graphs . This button is also used to control other options. To test the quality of the optical system use Plane of Best Installation Option before calculating parameters and performance characteristics.

For quick setting optical systems with tilted mirrors use the New element and Single surface options (Resource option from horizontal bar menu).

Use the Telescope example to set Ray Stops and Screen surfaces in the mirror and mirror-lens systems in a correct way. If you need to set an optical system with tilted and decentered surfaces it is helpful to open Optical 3-D viewer ( 3-d button, Tool box), then click Coordinate axes button to check the entered tilts and decenters.