Looking at your file, I see the rays are striking your optic at the center of the optic, directly upon the local axis of the object:
Consider the sag profile of the Standard Lens type, as shown below:
If we plot this equation for k = 0 and k = -1, then we will see that for your aperture, the sag profiles are essentially the same:
It is only at large values of “r” that we start to see some deviation, as shown below here:
It is for this reason that an off-axis mirror is typically used at some point offset from the local axis origin.
In Sequential Mode, we can achieve this through the use of an aperture decenter and/or Coordinate Break surface, as is shown in the sample file C:\...\Zemax\Samples\Short course\Advanced Optical System Design Using OpticStudio\OAP_OSDUZ.zmx.
In Non-Sequential Mode, I would suggest switching to the Off-axis Mirror object type. This object type lets us define the surface sag, as well as the surface offset as discussed in the following forum post:
Looking at your file, I see the rays are striking your optic at the center of the optic, directly upon the local axis of the object:
Consider the sag profile of the Standard Lens type, as shown below:
If we plot this equation for k = 0 and k = -1, then we will see that for your aperture, the sag profiles are essentially the same:
It is only at large values of “r” that we start to see some deviation, as shown below here:
It is for this reason that an off-axis mirror is typically used at some point offset from the local axis origin.
In Sequential Mode, we can achieve this through the use of an aperture decenter and/or Coordinate Break surface, as is shown in the sample file C:\...\Zemax\Samples\Short course\Advanced Optical System Design Using OpticStudio\OAP_OSDUZ.zmx.
In Non-Sequential Mode, I would suggest switching to the Off-axis Mirror object type. This object type lets us define the surface sag, as well as the surface offset as discussed in the following forum post:
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