Alissa Wilczynski wrote:

Hi Oliver,

In your model, you’ve set fixed apertures on the front (row 1) and tilted (row 3) surfaces. The semi-diameters are measured relative to the surface’s local coordinate system, not a global coordinate system, so your aperture size on the tilted surface will need to account for the angle of tilt relative to the front surface and increase the semi-diameter accordingly. 

You’ll also find that just increasing the Semi-Diameter value on row 3 may not actually change your drawing. If you click somewhere in row 3 and then expand the surface 3 properties, you’ll be able to control the surface aperture with more granularity.

 

Dear Alissa, 

Thank you for answering. 

I understand what you mean. Just want to correct one typo in my lens data editor. The semi-diameter of Surface 3 should be 0.0625 instead of 0.625. 

Oliver

I indeed find a method to keep the aperture constant (according to what I undersstand).

I can set the Aperture Type of Surface 3 as Elliptical Aperture, the X-Half Width is 0.0625 (just the radius of the fiber cladding), and the Y-Half Width is 0.0973. 

Here the Y-Half Width comes from: 0.0625/cos(50°)≈0.0973,  and the tilted angle is 50 degree.

However, I wonder if there is an automatic way to do this, for example, Pickup or ZPL Macro?

Thank you. 

Oliver