Caution

The datas entered in the tables are saved only if the "apply" button has been activated.
Before saving input datas, all the active cells have to be filled.

==========main PARAMETERS==========

R
It is the radius of curvature of a surface. It is either a non null number or "infinite".

n and V
For a refractive surface, the refraction index n is either a number (larger or equal to "1") or a reference of a glass catalog. If the refraction index is a number, the associated constringence is a number strictly larger than "1" or "infinite". If the refraction index n is defined by a catalog reference, its constringence V has to be defined by the same reference. Air and vacuum have a refraction index equal to "1" and a constringence which is "infinite". For a reflecting surface, "mirror" must be entered as the refraction index. In this case, the constringence is the same as that of the previous medium.

d
For the object surface (identified by "obj"), the distance d to the next surface is a number or is "infinite". It is a number for all other surfaces. More details about its sign are provided in the "Coordinate systems and sign conventions" section of the "main parameters" table tutorial.

D
The diameter D of the surface is a positive number. Its value is such that surface boundaries can exist.

V paraxial
If the selected surface type is "thin lens" or "thin lensXY", the V paraxial cell (constringence of the lens) is activated . It can either be a number or a reference of a glass catalog. The medium before and after a thin lens or a thin lensXY is necessary air or vacuum. Therefore, before and after the surface, refraction indexes are equal to "1" and constringences are "infinite".


For more details concerning the "main parameters" table, see the related tutorial.

==========NON SPHERICAL SURFACES PARAMETERS==========

The conic constants K and K_y as well as the polynomial parameters A_2n are necessarily numbers.
The focal lengths f_i and f_iy are necessarily non null numbers or "infinite".
The radius of curvature R_y is a non null number or is "infinite".
The pitch of a grating is a strictly positive number and its order is an integer number.

For more details concerning the non spherical surfaces table, see the related tutorial.

==========LINKS AND OBTURATIONS==========

Except X_shift and Y_shift that can be either negative, positive or null, all other aperture/obscuration parameters are positive or null.
D_max values can not exceed the value of the diameter D of the surface defined in the main parameters table.
D_min < D_max.
The only limitation on X_max and Y_max is that they define surface boundaries which are achievable.
In any case : X_min < X_max and Y_min < Y_max.


For more details concerning the links and obturations table, see the related tutorial.

==========TILTS AND DECENTERS PARAMETERS==========

Θ_X, Θ_X-Bef, Θ_Y, Θ_Y-Bef, Θ_Z and , Θ_Z-Bef are numbers with absolute value smaller than "90 °".
Δ_X, Δ_X-Bef, Δ_Y and Δ_X-Bef are numbers.

PΘ_X, PΘ_Y, PΘ_Z, PΔ_X and PΔ_Y are integers from "1" to "5" and are all different from each other as well as PΘ_X-Bef, PΘ_Y-Bef, PΘ_Z-Bef, PΔ_X-Bef and PΔ_Y-Bef.

Contrary to the "full user defined" option for which there is no constraint on priorities, "rel. to a surf.", "rel. to chief ray" and "dec. rel. to a chief ray - tilt rel. to surf." options request that decenters are grouped either before or after the tilts.

For more details concerning the tilts and decenters table, see the related tutorial.

==========CONSTRAINTS PARAMETERS==========

The scaling factors have not unit. They have to be positive or negative numbers and must be defined so that the surface dimensions are compatible with the surface diameter defined in the main parameters table.

Note that for a constrained surface, it is possible to define a parameter as not constrained by entering "0" in the correspond scaling factor cell.