
Advanced options
Note that ray aiming is experimental at present.
The following options are defined on the Advanced options window:
- Afocal
- If this checkbox is unchecked, new analysis windows will perform ray analysis using ray positions at the image surface. If this checkbox is checked, new analysis windows will perform ray analysis using ray directions at the image surface, equivalent to ray positions at infinity.
- Telecentric
- If this checkbox is unchecked, the chief ray is aimed at the center of the paraxial entrance pupil. If this checkbox is checked, the chief ray is aimed parallel to the optical axis, as if the entrance pupil was at infinity. If checked, do not expect ray aiming to work.
- Update semidiameters using real rays
- If this checkbox is unchecked, semidiameters marked automatic will be updated using a y-fan of paraxially traced rays. If this checkbox is checked, the chief ray is aimed at the real aperture stop, semidiameters marked automatic will be updated using a y-fan of real rays. The default is "checked".
- Use stop aperture coordinates
- If this checkbox is checked, the scale of normalized pupil coordinates is adjusted so that Py = 1 is the edge of the stop aperture. Note that you should put an aperture on the stop if this option is to be used.
- Enable iterative ray aiming
- If this checkbox is unchecked, the chief ray is aimed toward the paraxial pupil (or parallel to the optical axis for telecentric input). If this checkbox is checked, the chief ray is aimed at the real aperture stop.
- Tolerance (for ray aiming)
- This is the tolerance for steering the chief ray if iterative ray aiming is enabled. The angle of the ray in object space is adjusted until it misses the center of the aperture stop by less than this amount (in mm).
- Check apertures during ray aiming
- If this checkbox is checked, rays can be vignetted by apertures during ray aiming setup.